Almost all the exchanges do this for the money that is why they are always quick to list shit coins because they know it's would be an opportunity for them to make fast money. This is why we have seen that Binance is very strict these days increasing the requirements for a token to be listed on there exchange. There are also exchange like OKX that like listing shit coin and later when the coin lost momentum they would delist it after they are not making money from such project.