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).
Admin of course do that, but only limited for forum ads, if you're talking to bounty campaigns or project Ann, the n community volunteers do the right thing and make a scam accusation against those scam projects.
The user/investor/bounty hunter should be responsible for his/her move before joining on any project posted here.