Scams are hard to get rid of, but experienced bounty managers may not recruit potential scam projects early in the review process. Let there be fewer bounty campaigns, but they will be of higher quality.
We don't blame the project that did the scam. We have to blame the stupid participants who continued to follow the scam campaign even though it was clear and was told by senior members that the project was a scam but forced to join.
That's not always the cases, sometimes legit projects end up scamming participants, I've seen few projects that get listed on top exchanges but refuse to send tokens to all bounty hunters, others hold tokens for years until you forget them, all you will get is they haven't launch yet, why introduce a bounty campaign if they aren't ready to launch the project yet?