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> and if you can't convince a domain registrar to give you a domain

This is the problem. If nobody wants to host my speech, fine: I can set up a server in my own bedroom if need be. But if nobody accepts my domain, it's not quite so easy to set up my own registrar.

Private companies arbitrarily censoring domain names is a can of worms that shouldn't be opened. Registration must be held up to a higher standard, like an utility.