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 think it is high time bounty managers get their information from the team at the beginning of the bounty campaign than changing rules concerning bounty at the end if the campaign. For instance, I might not be willing to disclose my personal information in a bounty. I will be forced to release such information as long as I have worked for the bounty and they are requesting for kyc at the end of the campaign.