There Are many exchanges where exchange authority listed shitcoins only for money and later, they delist these as like responsible Exchange owner. Let's Have an example With MEXC Exchange! I saw some coins Pump from 600% to 18,000%, many coins pump more than 13000% and that's make me wonder. So i also tried to buy new listing altcoins.
But i experience that, New altcoins already pump 300-500% within seconds. Lol. Although i had opportunity to buy overpriced coin cause some coins goes more than 20000%. But i did. And later team create more hype so that more people joined with then. And after a certain time, team dump their share and run away.
So should be careful such shitcoin games. It may increase your money thousands time but i think, people will loss more than gaining
Exchanges don't list and delist any coin/token in seconds but they do all other activities to hype a project or they are the one who is creating the fake trade orders to increase the price of particular project, when actual investors buy them for the hyped price then they will dump them or create no sell orders for that price and let us hang dry with useless tokens.