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