Every bounty's official telegram channel is seriously being restricted to bounty hunters from making comments or post about the projects campaign concerning payments of rewards, and that is seriously not being tolerated from any campaign managers or group admin. And at most times, it is stated. I have observed one concerning a project that was a scam, there's was deleting their telegram bounty group, channel and official telegram group. With this action, it was made clear that they are completely scam, but what makes it funny was their softcap and hardcap where successfully archived smoothly.
Also, when the group admins are no more active, or no reply from the main team members of the project, then things fishy are going on.