I think you can understand that only from investors. Because big investment companies will not invest scams surely. Other than that you can not trust team section or whitepaper. Because maybe they gave huge money to good devs for writing good whitepapers or they can create fake team with fake linkedins etc.In my opinion investors are the best place for that.
If you read there platform then you can determined the project wether it is a scam or not because in choosing it depends on you, in my opinion much better to look for the number of participants and how the management handle the previous project.