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.
Yes I agree to this, strict rules must implement to get rid of bounty hunters who are very greedy who uses a lot of dummy social media accounts just to get a lot of stakes. If there is authentication, then they cannot do it since it needed a btt account to do so.