You should not say all of IEO and ICO were scam. Almost all of icos have already started from ICO and IEO, how you can say like that when these kinds of fundraising have already helped crypto to be big like this time. There is a lot of trusted icos in the market. The problem is some of these icos were scam.
Yes, it is true. even early 2017 became very unusual for ICOs with a lot of crypto adoptions taking place. Even though now many projects are a scam, that doesn't make them all a scam. Until now IEO also still has projects that are successful in the market.