To my understanding, KYC simply means "Know your customer". Investors(customers) who participate in ICO are made to go through KYC process before they are even allowed to purchase their tokens. On the other hand, Bounty hunters are just "part time workers" of the project and not customers. Even if they will be made to go through a KYC process, it should be before they start working and not after. Waiting for them to finish working for the project and refusing to pay them because they failed to pass KYC afterwards is a total cheat.
i second your idea whereby bounty hunters and not pre-informed before starting of bounties for KYC but when after they are done with promoting the project, then there come KYC which when most of them fail meaning lost of bounty tokens. its a total cheat and bounty managers should make enquries from the team of the project about KYC so that bounty hunters may know scratch.