The success of ICO lies in the hand of huge partnership support, huge investors and trust but since scammers canes around ICO trust was ruined but now what we have left is IEO, and I will keep repeating myself over and over for new projects that the success of an IEO is top exchanges, no matter how good your use case is, if you choose p2pb2b or vindax over Okex or binance just have it at the back of your mind that failure awaits you with 80% chance over 100%
You are partially right. It all depends on the project and on the people who are working on it. In principle, it is enough to get acquainted with the idea of the project and with the development team to understand whether it is worth investing. IEO may end like ICO