Well, I believe that the investors complaining are those who are not buying IEO from the right exchange.
For example, vindax is an exchange that gets a lot of IEO listing weekly but the truth is that those projects don't ever run successfully due to the fact that vindax lied about the numbers of users trading on their exchange, thereby making the purchase of the coin useless since one might not gain anything in return when the coin is being listed for trade on the exchange. Aside this, I don't see any other reason why investors would have complains about IEO.
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For example, vindax is an exchange that gets a lot of IEO listing weekly but the truth is that those projects don't ever run successfully due to the fact that vindax lied about the numbers of users trading on their exchange, thereby making the purchase of the coin useless since one might not gain anything in return when the coin is being listed for trade on the exchange. Aside this, I don't see any other reason why investors would have complains about IEO.
Even lesser known exchanges such as Cobak and P2PB2B have 17 ongoing IEOs each.
This will definitely lead to more scams and I think ICO scams are started rolling out in the names of IEO but the really unfortunate thing here is, this time those scammers are in action with the help of exchanges. Really bad for entire crypto industry .