True, but all laws are based off someone's common good. I know people love to say "the state shouldn't legislate morality" as if it means anything, but the truth is that every law is rooted in someone's morality and basing societies off traditional Western, Christian morality instead of whatever Jeff Bezos thinks is okay works better for society at large.
Libertarians have no problem with authoritarianism so long as multinationals are doing the authoritarianism instead of the state. For lolberts Twitter being able to censor anything it finds objectionable is fine, but the state being able to do that is literally Gilead, Nazi Germany and the USSR combined.
Definitely.
If you want to look at the problem from a classical liberal standpoint you'd probably solve it by, say, treating tech companies with a given number of users as "public squares" and stopping them moderating legal speech. I'm about as illiberal as they come but FWIW, that seems like a workable solution.