Could be a good idea but unless bounty hungers stop participating in those bounties, they will keep coming up.
Yes! But we can't stop them by joining and joining a lot of scam bounties, We all know that the more you have bounties the more chance of gaining profits.
Promotion is important for good product but how it's going to be happen in the future is not known by anyone if it is a scam then we don't do anything against that leaving that project will be the good idea for anyone to make his field more useful.