I feel that all criteria that you have listed can help to detect a scam project, but the real problem is that big scammers are acting like professionals and it is extremely hard to mention any of these by their attitude. However, even such projects are stealing money, so we need a better way to detect them.
It is obvious that the more often scammers open the more neat and trickier they become. The largest scams that have collected the largest amount of money can still be called deception professionals.
If you are asked to give your money, they promise huge profits, but the project itself ignores or hardly answers uncomfortable questions - most likely you are scam.