I'm not disputing that X has a legal right to monetize the content, but I am not remotely convinced that (1) X has the _exclusive_ legal right to monetize the content (content creators add no value and thus have no right to the content, which seems obviously absurd) (2) X has the exclusive legal right to prevent others from distributing the content for free or (3) your "network-effects-derived moats justify a legal right to monetize content".

You seem to be depending on a whole lot of assumptions to get to your "XCancel/Nitter/etc shouldn't be allowed to exist" conclusion.