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.
You might be right, cause i know the struggle of doing KYC, i had met a project that asking many kind of data for the KYC, such as ID, and proof of address (in a form of bill).
The last one is harder to get, since i'm still living with my parent, so i don't have that kind of data, all kind of bill still has the name of my parents. So that is really painful, and none the last when i've got the bounty reward, the price of the reward isn't equal with the effort that i done.