KYC for bounty hunters is a common thing now. This is not a sign of a scam, moreover, many of the ICO warned about this in advance.
You did not read the whole post it says they change it and now required that bounty hunters do a KYC, some bounty hunters do not participate on bounty campaign that requires a KYC and changing the rules at the last minute only proves that they do not want to pay their bounty hunters.