

Policing the speech of other people = authoritarianism, yes.
Copyright is a government-granted (and enforced) monopoly. Under anarchy, no one would benefit from copyright protection, at least not the same way we have it now.
People could voluntarily police their own speech to stay in an association… but I don’t know how/if that would scale.
Analysis and review are fair uses available to everyone.
The military does have fairly broad ability to violate, or even nationalize (and then classify), copyright and patents. Technically they have to justify that with a national security claim, but those are rarely reviewed or rejected. I doubt any of the U.S. armed forces pays for a public performance fee when barracks movie night exceeds 10 individuals, even if the movie is Disney.