As far as this forum is concerned, Imo I would have suggested that the admin can also ensure that scam project are not allowed to advertise here but I think I have also seen some bounty threads being tagged as warning for participants (or maybe they should just remove such thread entirely).
On the other hand, is difficult to ascertain scam project at the beginning.
I advise that participants could choose to follow certain legit managers and managers that are producing scam projects will be alone to themselves and pack up with time

Buddy, You should know that people got red trust by promoting scam projects like Nexxus Rewards, Zeux. This forum's members are always careful about the scam, Ponzi scheme, HYIP shits, so, no one is allowed to promote scam projects here. But how can you protect a project that was good but now they scam or run away? That's the question and its the thing that OP trying to say.