yo bro , i guess u misunderstanding about what behind IEO . IEO is Initial Exchange Offering , and why should i curious about IEO on bullrun , since IEO is focused from exchange, no matter even bullrun or not, when the exchange have good reputation , their IEO also giving a profit.
IEO became popular after bull market of 2017 right?
the reason behind it is because binance try to use that method again as the binance launchpad , and within a short time, other exchanges followed suit.