KYC for bounty hunters is a common thing now. This is not a sign of a scam, moreover, many of the ICO warned about this in advance.
That is great idea which can be form as canvas if that bounty is good or not. We all know scammers sorrounds all over the world just to big crypto that can make them happy. Possible their are KYC which is good for bounty hunters that can give idea to everyone who joined ICO.