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.
It is a total cheat they know that some bounty hunters will in no way do a KYC and would rather leave the campaign or do not claim their rewards anymore, and because of that they will a surplus of the bounty stakes, I don't trust these people who change their rules so often to their benefit.