As a rule, such a procedure is attempted to reduce payments related to bounty companies!
Kyc for bounty hunters is not a fraud only if it is announced in advance. If after the campaign, it is fraud and extortion.
I favor you that it is a fraud. You have to ask all of the projects from the beginning as in this way they may not tell you a lie and at the end they will not change their words and if they will do then it will be easy for you to start a scam accusation.