If it becomes known that some relays are notorious for banning people clients may decide to implement some alternative heuristics, like (this is just a crazy idea that just came to my mind and I'm sure there are better solutions) if stupidrelay.com starts censoring a lot of people then someone may create a not-stupidrelay.com and every time one would publish to or read from stupidrelay.com they also do it for not-stupidrelay.com, I don't know.