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.
Indeed, bounty hunters are not the customer of the ICO, they are the supporters of the project.
The most unfair thing is when the kyc rule was not announced at the start of the campaign, but at the end.
As long the rule has been announced in the beginning, hunters can decide to not joining the campaign from start.