Yes of course we can stop promoting scam projects, but how? And here are some tips that we can get to avoid promoting those scam projects, review the team and of course the quality of the product of the project and look the reviews and opinions also to get infos that we need to prove that the project is legit.
But projects in the ICO / IEO phase look legit, the problem come when they end the token sale. After that they stop communicating and developing their project. Why? Because they already have money, what else they need?