For a starter, I hate been redirected out of forum to go read some article, if you're the original owner of article then post then on forum and you can add a source link at the end for reference purpose or indicate you're the original owner of article to avoid been accused of plagiarism.
In addition: There's a disadvantage I have noticed in the past project that carryout their crowdfunding through IEO which is very disturbing. The whales are manipulating the sales, they buy all the token in matter of sec/mins leaving the average investor with no token to buy which is bad because this guy's can easily manipulate the price of this coins/tokens when they hit the market. Exchange need to find solution to this issue which could be solved by putting buy limits on each account.
yes you are right, and that's the biggest disadvantages of the IEO most expecially on bigger exchanges like bittrex and binance where IEO sales finishes in matter of seconds leaving the smaller investors astray only for the whales to manipulate the prices later on