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.
Hum you are right, this is boring announcement to need pass kyc after bounty finished. Therefore, it is announced before the start of the germinated and bounty. Actually I can say it to my guess that kyc needs to be made only for ICO investors. If there is too much kyc bounty hunter there can not deceive anybody there.