In order to find scam projects you need to know how good projects are. Each of the projects is different and I can not list the standard ways to find them. But if you get enough experience with a nonscam project, you will not have any trouble finding scammers. Also always read the project's whitepaper carefully, search the team thoroughly, and look for the scam accusation section here.
I never thought the way you gave it could succeed in finding out about the scammers project, because in my opinion for now the scammers project can even fake the team and the road map they made, because the fraudsters have been very good at designing everything. So to find a project that is fraudulent or not is very difficult to ascertain.