I think that the shitcoins pay exchanges to be listed. If that is the case, then it is in the exchanges interest to make money by listing these coins. I would prefer that they decide not to do this. but it's their choice.
there is a bad effect for those exchanges because they are being used by pump and dump teams that manipulates the shitcoins from their exchange and victimizing noobs and some newbies as well as those Greed investors.
maybe it is better if we will be having list of exchanges that support these shitcoins so people may have references on which exchange to use and buy their investments materials.