to be honest it is very difficult to be able to find out about a scam project, many projects are convincing but eventually there are also a lot of scams like the one currently being 4NEW (KWATT). who will know the project will scam usually only those who make the project. we never know what's in their hearts.
when we plunge into this world of course we must be prepared to bear all the risks that will occur to us. I've heard that someone has said RISK = PROFIT.

So I'm sorry I can't give you the criteria for a scam project. maybe other members know.