I sincerely think IDO has taken over IEO and ICO for good, although this carries a lot of risk because of many anonymous team and many rug pulling. Nevertheless it has proved to have to be a good and a better way of raising fund without giving money to CEX. Many CEX will be shutdown soon as DEX is much more improved upon.
Do you really think that initial offering through DEX can be trusted more than a centralized initial offering. This is the first time i am hearing this argument, the risk is really high for these and you cannot expect anything to be fair simply because of the nature of the platform you are talking about.
Even if there is something new it will last till the hype lasts and then it will fade away.