I have a topic which I created about KYC or bounty hunters, if good or not and several people are sharing their views.
In my personal view, I will say yes, there should be KYC for bounty hunters. KYC will help reduce most people who cheat the Bounty system depriving the genuine hunters not to earn as much as they should, in the other hands, Any project that would like hunters to pass the KYC should define the rules at the beginning of the bounty program not at the end of the bounty hunting. So that those that want to join can join the bounty knowing the rules already.