Icos have been replaced already by ieos, and while ieos had a certain period in which they were very popular we are experimenting once again with ieos what happened with icos.
People are losing confidence in ieos because they are not performing as expected, and while this may surprise some investors it doesn't really surprise me because the only thing that has changed is the way the developers received the money from investors but the projects behind that process have not changed at all.
IEO's still not a guarantee that they are legit replacement of ICOs so we should still extra careful of IEOs as most scammers are also doing this in those exchanges that list IEO at low listing fee, so they are taking granted for it, also does not guarantee that if they are legit we will have more income because it still depends on their project.
at least we can see the seriousness of the project that will sell IEO. logically, there are no good projects that are willing to have their coins traded on bad exchanges. although with expensive fees if they are serious about looking for investors I think it is important for developers to consider the best exchange. at least it reduces the risk of a scammer.