This is indeed in my opinion one of the achievements of Harmony, especially IEO, which was done by Binance which was able to provide substantial ROI in a short time. but if we look at the condition of the last IEO, many actually lost due to the difficulty of getting tickets and also after that BNB experienced a considerable decrease
and that was expected to happen in many IEO soon this will become worst this is only good at start since many people get profit in it but the next IEO will became useless token also.
We are talking of the platform here, there are projects in IEO that are profitable and there are not.
I think most of the IEO are not even profitable at this stage now, AFAIK, only those projects that are in big exchanges are gaining popularity like in Binance but I believe IEO is not profitable in overall.
Most IEOs from Binance benefit 5x the number of participants who participated, but now Binance hasn't announced and when IEO will be launched, but there are also other IEOs on the market that are successful with a good marketing team, I'm sure it will be as successful as IEO at Binance.