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.
Yeah it is true that we are not customers but we still should follow their rules. We pay them using our work the same to those investors who pay using their money. I think it depends on the company who cheats about KYC. I haven't experienced it yet.