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 right, the success of IEO as a fundraising method depends solely on the exchange hosting the IEO. Ico sure did had it's time but the scammy nature of most projects that emerged and abuse the good will of raising funds with ico ruined everything. About p2pb2b and vindax, they are indeed exchanges that every project looking to raise fund should avoid as everything seems to be wrong with them