https://www.vice.com/en_us/article/wjwd8n/hacker-drops-steam-zero-day-after-being-banned-from-valve-bug-bounty-program

Security researcher Vasily Kravets publicly dropped a zero-day for the Steam game platform last week after saying he was banned from parent company Valve's bug bounty program.

Kravets, who is a security researcher for the R&D department at Advanced Monitoring in Moscow, said that the trouble began in May, when he reported a security bug in the Steam gaming platform through HackerOne. HackerOne handles the bug bounty program for Valve and for a number of other companies. Valve said banning him was a mistake.