The main problem of kyc in bounty is the team says about kyc after all work done. It is really cheating. I never go through a campaign which asks kyc.
That's a problem especially if you participated for 3-4 months. In this case you have two ways: pass the KYC or just leave campaign without any tokens.
Managers and the company insure themselves by pointing out that the rules may change any time. So if at the beginning there was no KYC it may appear at the end.