There are bounty hunters who dont listen despite of the warnings, they just follow their own instinct without asking for others opinion. Well those bounty hunters who only look for rewards are partly to be blame why we cant get rid of scam projects. They dont do their own research and just blindly join without checking the projects's background.
Thats why we need to be careful when choosing a project because not all promising projects can end up as not scam.
Before choosing a project to participate in the bounty, you need to understand for yourself - do you want to earn a few dollars right now, or do you want to get coins that can grow well in the future? If you want to make money now, then look for bounty where they pay in bitcoins with weekly payment. If you work from the perspective, study the projects well, read the white paper, see what participants with high ranks write about the project.