KYC checking bounty managers will not solve any problems for bounty hunters. In many cases, this is the same hired worker. Even if the ICO bounty manager is a member of the ICO team, he can pass through the KYC test as many of us go through - providing not his own data and not his personal document. It would be better if such a check will be carried out by the ICO team, and even better if their documents are checked by the relevant government authorities during registration at the ICO location.
I believe that KYC for bounty managers will help to reduce fraud on their part . Have you never got into a situation when the bounty manager did not fulfill his direct duties? If you have already decided to hold KYC, then let it be mandatory for absolutely all campaign participants, including the organizers