The main question is - How to make your own choice and how to avoid bad influence, and understand when you are scammed?
I don't know why you're having a hard time on this. If you think you can't trust someone trying to attract your investments, then don't. The thing is, you invest in the project not the people behind the project. Do the research on your, it's not that hard but it takes time. Never fall for advertisements, a good project will help make a name on its own.