I really think these IEO thing is only good for the top exchanges and these is because they have the liquidity and the traders to pump a coin after listing, which is why their IEO projects are usually successful.
But the smaller exchange don't have the same and their IEO success rate is no way near the top exchanges. Maybe 2 out of 10 IEOs conducted on the small exchanges would succeed, while top exchanges boast of a success rate of like 9 out of 10.
True you said that the most frequently successful IEOs are exchanges with good market backgrounds and these good exchanges are Binance, Kucoin, Bittrex, Okex, and Bitforex and some of them are not which is good for me because often the price of the token does not improve as it enters the platform exchange.
Yes, you are right the successful IEO's are from the potential exchanges like Binance, Kucoin, Bittrex, Okex etc. Of course, IEO's already listed on those exchange cannot able to increase their value but only from the Binance those coins has given very good profit to the investors.