It's funny to me when conservatives talk about the sanctity of private property, and then want to force the owners and publishers of certain sites to have zero control over their own property. You can't have it both ways.
Also funny to me that conservatives censor like mad in their own properties. Parler, /r/conservative, RedState, and too many others to count, would delete posts from people like me on sight. Do you consider that censorship too, or is that acceptable?
Nobody's saying you can't run a small Federated server on Mastodon, for example, and "play god" with your users, but if you do that on a national level you need to be made to stop.
Any monopoly can claim that since were all in a free market system, it's merely customers making free choices that's causing an incorrect "appearance" of a monopoly to exist. But you can ask any journalist, legislator, or other public figure if there's another 'competitor' that can provide what Twitter provides, and the answer is simply "no".
If we were talking about gaming consoles or some other type company the monopoly perhaps wouldn't matter, but we're talking about communications infrastructure for the entire nation, and frankly world. We simply cannot let a handful of unelected overlords censor the world.