know of a scam for sure ICO is not easy. many have found out this after half-way or even the end of ICO. fishy things might be found by doing the research. see the wallet on investment is it true fit, look at the team and the concept of the ICO has also become a way to prevent a scam though not certain that certainly is.
What make it worst is project scam when listed on market. We can't said it scam because it already success in ICO, but not really focus on their project after they get a lot of money. But for me it still considered as scam.