IEO - Initial Exchange Offerings, are not crowdfundings for launching new exchanges, they are just like ICOs, but instead of developers conducting the token sale themselves, via smart-contract, a third party (exchange) conducts it on their behalf, with things like capping contributions per user, destroying unsold tokens and so on. People believe that IEO's are less likely to be scams, because exchanges care about their reputations and check the projects that they list.
I personally believe that IEO's are not really different from ICO's, and in fact they are just rebranded ICO's with extra steps, and they have just about the same level of scammery. The difference that IEO scammers instead of running away with money after a few months will just fake activity, tweeting that they work hard and soon the project will moon, while their useless token goes to zero.
IEO always better then ICO but some exchange will scam investor and peoject like: Idax
Truly be careful about IEO's. I know of a surety that Idax has used this means to scam some projects off their money as well as investors and users of the exchange. Stay clear off Idax. And remember don't invest what you cannot afford to loose.
and Coineal is big scammer for IEO:
Source:
https://finance.yahoo.com/news/crypto-exchange-coineal-absconds-cybr-125010621.htmlThey scam many peoject IEO on their platform. After IEO end, they delete project and steal money from invstor.