So introductions to KYC in a bounty means the bounty manager is a scammer? There are few moves like this from some old bounties and it's the project team fault not the bounty manager, if the team decide to change rules there is nothing that the bounty manager can do about it, if you don't want to work for nothing you will have to comply
As said by the OP the KYC is decided by the team and not the bounty managers . It's on the users to decide if they want to participate in bounty if it's needing Kyc. Also the project should be clear about the Kyc requirements from the beginning.