I didn't say they're outbidding the black market, but they are quite generous and it is a legal action at that point. Makes sense to me, because they actually care about security and it's worth paying out to protect users and the brand. It also serves as a unique recruiting tool.
Re:Hacking Team: a zero-day market case study
by FireBeyond on Sunday July 26, 2015 @06:52PM
(#9952484)
Seems to me you could "quite easily" double dip.
Sell your exploit on the black market. A day later, sell it to the vendor. "Sorry, they must have found and patched it"? Just ask Facebook not to disclose your information when highlighting vulnerability payouts.
It's interesting to me that there's a real market price for an Adobe Reader flaw, but that Facebook flaws have (generous) fiat prices set by Facebook.