Ofcourse it is!
Nowadays, I notice most of bounties have strick rules, making bounties more organize and I like that Bounty Manager requesting Proof of Authentication to limit scammer .
It's been one of major mistakes of bounty hunter like me not to read rules and requirements of each bounties ending up not getting stakes so it's very important to read and understand each rules to ensure that we're doing the right thing and not wasting our time and effort.
kyc for bounty must be strictly implemented because there are many bounty hunters using multiple accounts to maximize their stakes which is unfair for those who are legitimate bounty hunters. this multiplication of accounts may decline the quality of work they produce.