Everything is almost a total gamble now, from the random meme coins getting listed both on spot and derivatives markets to those premarket coins as you said. The exchanges don't care, all they are looking at are t the trading volumes, more traders and profits through trading fees.
The good thing is they display a pop-up warning about the dangers of trading in such assets in the exchanges I have used. Should a user go past the warning, trade and make losses, then that's on him/her.