The IEO is a way to reach a lot of investors without having to spend a few% tokens to open a bounty campaign. However, currently there are only a few exchanges that are most noticeable about IEO: Binance, Okex and Houbi. It is very difficult to get IEO on these exchange
when an IEO project enters the market sale, I think ICO will be abandoned. however, we know that ICO developments are also good, some are not. it all depends on how the CEO designed the plan. in general, ICO will still exist, but we don't know whether such a system will survive a new sales system such as the IEO or not. when the IEO has a good impact on sales results, sooner or later, ICO will be abandoned.