Announcing KYC submission requirement at the end of the bounty is actually an unethical thing to do. If they wanted users to fill the KYC form,  they should have been warned before the users join. Some users like to stay anonymous and hesitates to share their identity online. So, legit bounty hunters like them might end up suffering. Again, those project that turns out to be scam, might also scam your identity by selling it at the black market. KYC has both its advantage and disadvantage.