Those are still shitcoins even if they do an IEO on a large exchange. If you bought late, you will end up a bagholder of that coin. If you plan to invest on those coins, be wise. Buy quick when IEO started then sell it when you are already on profit.
I think ICO and also IEO time has been over, even binance now introduce coins mostly in farming way, like Flamingo, Hard , etc, now most of the projects if they are Polkadot blockchain-based, would hold IPO , and the others would do yield farming like OASIS ROSE , some do IDO, to decrease the risk of getting scammed but still some turn out scam!