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.
Agree kyc must do before you work in the project because sometimes kyc do failed and at the end you will not receive your token because you failed on it, but many people point is why they need to do a kyc? They are just a hunter and didn't invest on the project, I think most of the bounty hunter joining many account when they know that the project will paid a high value or it was legit.