do not invest ICO will 100% avoid scam.
It´s definitely the best way to avoid scam ICOs but if nobody invests in it, it will never become a coin and will never be tradable.
Even very good projects don´t raise much money and become a hit after launch, I think Binance is a case like that, some others drop their price like crazy after tradeable, still others are good projects and don´t reach soft cap.
To an investor is always good to check the project itself, the team, the viability of the offer and other things like caps and all.