Before we explore the opportunity vectors, we need to understand the need and the depth of the given responsibility, Many companies build a safe interface and then challenge hackers/Pentesters to find vulnerabilities and break into the setup. Of course this happens in an ethical environment, as the said attack happens within a specified scope and under information to legal owners of the web app. The entire process, which can get rewarded the penetration testers with significant bounty on finding a valid security vulnerability is called as bug bounty.

How Organizations Benefit from Bug Bounty Programs

1. With bug bounty programs, organizations get clear picture of their system, increasing the likelihood that major vulnerabilities won’t be overlooked Or cause any potential damage.
2. There is no such thing as a perfect system. No matter how much you test your software, it’s going to have some bugs. It’s best to get that bug detected and fixed so it doesn’t lead to any major loss, unlike data leaks, we read everyday.
3. Importantly Bug bounty programs actually save money. A data breach can lead to millions of dollars’ worth of damages, not to mention the damage to the company’s reputation. Paying a few thousand dollars through a bounty program is much cheaper than losing valuable data.

How Hackers Gain from Bug Bounties

• Bug bounty programs give them a great opportunity to test and hone their skills.
• The challenge adds to the fun of hacking. Also, it is white-hat hacking, which means it’s ethical and completely legal, which is a great sustainable way.
• They get cash rewards that can be quite substantial, ranging from 200$ to 50,000$+
• When they win a bounty, they gain recognition among their peers, and a good will is established as they are honored with mention in companies Hall of fame.

How worthful is it to try?

Once you get with the flow of finding OWASP top 10 bugs, you start encashing your skills continuously for bounty. Which might be from 1,000$ to 10,000$+ for RCE, and 500$-8000$+ for SQL injection in an average program. In 2016, Apple announced they would offer a bounty of up to $200,000 to hackers who found vulnerabilities in their products – and they are not alone. Facebook, The Pentagon, Tesla, Google, and Microsoft all run similar programs, offering big bucks for big bugs. Facebook has actually paid people over $4.3 million since launching their bounty program in 2011. Telegram offers millions if you break their encryption. There is a huge underlying opportunity in front of us, needs to be capitalized

List of programs

I recommend couple of program to explore for sure.

1. Hackerone.com
2. Bugcrowd.com
3. Open bug bounty
4. Synack
5. Intigriti
6. Zerocopter

List of other prominent programs

(ISC)2
.nz Registry
0x Project
123 Contact Form
18F
1Password Game
23 And Me
ABN Amro
Accenture
Accredible
Acquia
Actility
Active Campaign
Active Prospect
ActiVPN
Adapcare
Adobe
Adyen
Aerohive
Affiliate Coin
Aion
Air Force Mining
Air VPN
Airbnb
Aircloak
Airdropster
AIrMiles Shop
Airswap
Aisi
Alcyon
Algolia
Alibaba
Alien Vault
Aliexpress
Altervista
Amara
Amazon Web Services
Ancient Brain
Android
Android Open Source
Anghami
AntiHack
AOL
Apache
Appcelerator
Apple
Apple (Dev)
Appoptics
Aptible
Aragon
Arch Linux
Ark
ARM mbed
Armis
Artifex
Artsy
Asana
Asterisk
Asus
AT&T
Atlassian
Augur
Auth0
AuthAnvil
Automattic
Avast!
Aventus
Aventus Protocol Foundation
Avesta
Avira
Badoo
Bancor
Barracuda Networks
Base
Basecamp
BASF
Battle.Net
Beamery
Beanstalk
Belastingdienst
Belden
Belgian Rail
Belgium Telenet
Betcoin
Beyond Security
Bime
BiMserver
Binance
Binary.com
Bing
Bit My Money
BitAccess
BitBNS
Bitcoin
Bitcoin.DE
BitDefender
Bitonic
Bitpay
Bittrex
BItwage
BitWarden
Bizmerlin
BL3P
Blackboard
Blackcoin
Blesta
BlinkSale
Blockchain
Blockchain Technology Research Innovations Corporation (BTRIC)
Blogger
Booking.com
Bosch
Boston Scientific
Bounty Guru
BountyFactory
BountySource
Box
Boxug
Braintree
BRD
BTX Trader
Buffer
Bug Crowd
Bynder
C2FO
C2L
Campaign Monitor
Cappasity
Carbon Black
Card
Cargocoin
Carnegie Mellon University Software Engineering Institute
Cayan
Central NIC
Centrify
CERT EU
Chalk
ChargeOver
Chargify
Chase
Chiark
Chill Project
Chrome
ChronoBank
CircleCi
Cisco
Cisco Meraki
CJIB
ClickUp
Clojars
Cloudflare
Coalition Inc
Cobalt
Code Climate
Codex WordPress
Coin Janitor
Coinbase
Coindrawer
Coinhive
CoinJar
Coinpayments
CoinSpectator
CoinStocks
CoinTal
Commons Ware
Compose
Constant Contact
CoreOS
Coupa
CPanel
Craigslist
Credit Karma
Crowdfense
CrowdShield
Crypto Angel
CryptoNinja
Customer Insight
Custos Tech
CyLance
Danske Bank
Dash
Dato Capital
De Nederlandsche Bank
de Volksbank
Debian Security Tracker
Deco Network
Deconf
Defensie
Deliveroo
DeliveryHero
Dell
Deribit
Detectify
Deutsche Telekom
Digital Ocean
Discord App
Discourse
Distilled ODN
Django
DJI
DNN Corporation
DNSimple
Docker
DOD
DoorKeeper
DPD
Drager
Drchrono
DropBox
Drupal
Duo Labs
Duo Lingo
Duo Security
Dyson
eBay
Eclipse
ee.Oulo
eero
Electronic Arts (Games)
Electronic Frontier Foundation (EFF)
Eligible
EMC
Emptrust
Enterprise XOXO Today
Envato
Erasmus
ESEA
ESET
Ethereum bounty
Etherscan
ETHfinex
ETHLend
ETHNews
EthnoHub
ETHorse
Etsy
EVE
Event Espresso
Eventbrite
Evernote
Evident
Expatistan
Express VPN
ExpressIf
Expression Engine
F Secure
Facebook
FanDuel
FastMail
FCA
Firebase
Firebounty
Fireeye
First
FitBit
FlexiSPY
FlexLists
Flow Dock
Fluxiom
Fog Creek
Foursquare
Fox IT
Foxycart
Free Software Foundation
Freedom of Press
Freelancer
FreshBooks
FUGA CLOUD
Gamma
Garanti Bank
Garmin
GateCoin
GateHub
Gemfury
Genesis ICO
Ghost
Ghostscript
Gimp
Github
Gitlab
GlassWire
GLX
Gnome
Gnosis
GoDaddy
GolemProject
Google
Google PRP
Google PRR
Grabtaxi Holdings Pte Ltd
Greenhouse Software Inc
Grok Learning
Guidebook
Hackenproof
Hackerearth
HackerOne
Hackner Security
Harmony
Havest
HelloSign
Help Scout
Heroku
Hex-Rays
HID Global
Hidester
Hirschmann
HIT BTC
Honeycomb
Honeywell
Honour
Hootsuite
Hostinger
HTC
Huawei
Humble Bundle
Hunter
Hybrid Saas
HyperLedger
I SIgn This
IBM
Icon Finder
ICS
ICT Institute
iFixit
IIT-G
IKEA
Imgur
Impact Earth
Indeed
Indorse
Inflectra
InfoPlus Commerce
Infovys
ING
Instacart
Instamojo
Instasafe
Instructure
IntegraXor (SCADA)
Intel
Intercom
Internet Bug Bounty
Internetwache
Intigriti
Intrasurance
Invision App
IOTA
IPSWitch
Issuu
IT BIT
Jet.com (API)
JetApps
Jetendo
Jewel Payment Tech
Joomla
jruby
JSE Coin
Jumplead
Juniper
Kaseya
Kaspersky
Keep Key
Keepass
Keeper Chat
Keeper Security
Keming Labs
Kentico
KissFlow
Kraken
Kryptocal
Kuna
Kyber
Kyup
Ladesk
Lahitapiola
LastPass
LaunchKey
League of Legends
LeaseWeb
Ledger
Legal Robot
Lenovo
Leverj
LibSass
LifeOmic
Liferay
Line
LinkedIn
Linksys (Belkin)
LiveAgent
Local Bitcoins
Local Monero
Logentries
LZF
Magento
Magix AG
MailChimp
MailRu
Malwarebytes
Manage WP
Manalyzer
Martplaats
Massachusetts Institute of Technology
MassDrop
Matomo
Mattermost
Maximum
Mbed
McAfee
MediaWiki
Medium
Meraki
Merchant Shares
Meta Calculator
Meteor
Microsoft (bounty programs)
Microsoft (Online Services)
Microweber
Mime Cast
MIT Edu
Mobile Vikings
Mollie
Monetha
Moneybird
Motorola
Mozilla
Muchcoin
My Trove
MyStuff2 App
N26
NCC Group
NCSC
NDIX
Nearby
NEM
Nest
NetApp
NetBeans
netf
Netflix
Netgear
New Relic
NextCloud
Nimiq
Nitro Token
NMBRS
NN Group
Nocks
Nokia Networks
Nugit
Nuxeo
Nvidia
NXP
Oath
Observu
OCCRP
Odoo
Offensive Security
Olark
OneLogin
Onfido
Open Bounty
Open Office
Open Source University
Open SUSE
OpenBSD
OpenSSL
OpenText
OpenVPN
OpenXchange
Opera
Oracle
Orange
Orion Health
Outbrain
Outreach
OVH
OWASP
Owncloud
Packet Storm Security
PagerDuty
Panasonic Avionics
Panic
Panzura
PaperTrail App
Paragon Initiative Enterprises
Parity Tech
PasteCoin
Paychoice
Payiza
Paymill
Paypal
PaySera
Paytm
Peerio
Pentu
Perl
Philips
PHP
Phrendly
Pidgin
Pinoy Hack News
Pinterest
Plesk
Pocket
POLi Payments
Polyswarm
Port of Rotterdam
PostMark App
PowerDNS
Prezi
Private Internet Access
Proof Work
Proto VPN
Puppet Labs
PureVPN
PushWhoosh
QEMU
Qiwi
Qmail
Qualcomm
Quantopian
QuantStamp
Quickx
Quora
Qwilr
Rabo bank
Rackspace
Rainforest
Raise
Rapid7
Razer
RCE Security
Recht Spraak
Red Sift
RedHat
Regionale Belasting Groep
Release Wire
Report Garden
Request Network
Rev Next
Rhino Security Labs
Ribose
RightMesh
Rijskoverheid
Riot Games
Ripple
Rocket-Chat
Roll Bar
Royal Bank of Scotland
Rust
SafeHats
SalesForce
Samsung – Mobiles
SAP
Saveya
Scaleft
Secure Pay
Secureworks
Security Escape
Segment
Sellfy
Sentry
ShareLaTex
Shivom
Shopify
ShowMax
Shuberg Philis
Sifter
Sifter
SIgnify
Silent Circle
Silver Gold Bull
Silver Gold Bull CA
Simpplr
SiteGround
SiteLock
Skoodat
Skuid
Slack
Sli Do
Smartling
Smokescreen
SNS Bank NL
Snyk
Socrata
Solar Accounts
Solve 360
Solvinity
Sonatype
Sony
Sophos
SoundCloud
Sphero
Spilgames
SplitWise
Splunk
Spokeo
Sporty Co
Spotcap
Spotify
Spreaker
Spring Role
Sprout Social
Sqreen
Square
Starbase
Starbucks
Starleaf
StatusPage.io
Stellar
Stellar Gold
StopTheHacker
Studielink
StudiVZ (Report)
Swachh Coin
Swiggy
SwissCom
Symantec
Synack
Synapse
Synology
Synosys
Takealot
Talent LMS
TarSnap
Taxi Butler
TeeSpring
Telecom Italia
Telegram
Telekom
Telenet Belgium
Tendermint
TenX
Teradici
Tesla
TestBirds
The Atlantic
Thinkful
ThisData
Thuisbezorgd
Tictail
Tinder
Token Valley
Tokia
TorGuard VPN
TransLoadIt
Traveloka
Trend Micro
Trezor
Tron Network
Trustly
TrustPay
Tuenti
Tumblr
Twilio
Twitch Interactive
Twitter
Typo3
Uber
Ubnt
Ubuntu Server
Umbraco
Unchained
Unitag
United Airlines
United Nations
Unity
Unocoin
Uphold
Upscope
Upwork
Valve
Van Lanschot
Vanilla
Vasco
Venmo (App)
Verizon
Viadeo
ViewPost
Vimeo
Virtual Box
Visma Enterprise Oy
VK Vodafone Security DE
VSR
Vu Vulnerability Laboratory
Walmart
Wamba
Wave Stone
We Transfer
Weave Work
Web GUI
Webconverger
Weblate
Webmini
Websecurify
WeiFund
Werken Bij Defensie
Western Union
WhatRuns
White Hat Securities
Wickr
Winding Tree
Windows
Windthorst ISD
WINGS DAPP
WINK
WordPress
XenProject
Xiaomi
XYO Network
Yahoo
Yandex
Yelp
YouTube
Zapier
Zcoin
Zenmate
Zerobrane
Zerodium
Zeta
Zetetic
Zimbra
Zimperium
Zipline
Zoho
Zomato
Zynga

I would recommend reading medium articles and stay updated with hacktivity of hackerone. Stay updated with new CVE. Further updates in GLUG blogs. Goodluck with hunting. Thanks for reading!