Investments on an ICO is very much risky these days. But All of them are not a scam. You need to find them by yourself. It required research about that ICO. You can follow up with their telegram groups. All their social website about their activities. Besides you can read their whitepaper. If you found any lackings then ignore them. It's all about your hand, so think twice about to invest. Other hands you can buy coins from the reputed exchanger's. Invest those coin which has high volume or good reputation.