I think the most important point is white paper. Very often scammers have very vague information in it. I also pay attention to the project partners.
As time passes I give less and less weight to the white paper and the reason for that is simple, it is very easy to write about the incredible project that you want to create and how you are going to do it, but it is a completely different thing to try to execute that, that is what you should be looking for, how do you think the execution of the project is going to happen? If you have good developers then it's likely that the project will become a success but if the project does not have then it doesn't matter what kind of good ideas the white paper had the project will fail.