Fake icos promises unrealistic achievements. Once you see this know its a fake one, example, a project already talking about getting listed on binance when they are yet to reach their soft cap.
Too simple, everyone will recognize if the project does so. Now the project looks very real, but its true nature is scam. They still develop their project until the end of the ICO for several months, then gradually they will abandon it. That is how very smart scam of the ICO