Few days ago YFMoonshot bounty telegram group deleted. Their bounty finished date is 19 September and they locked the thread today which is before the deadline. I asked their telegram that why thread is locked but they kicked me out from the group and banned me. Their behaviour looks like suspicious. I think they can scam bounty hunters.
Base on what you said yes they don't want to pay hunters for that promotion and they believe locking the thread and kick out all participants will be a good solution. For you I suggest to open scam accusations against this project if they don't cooperate with the payment that hunters deserve ,so that project will be tagged as scam and no one will became victim again with that scam project .