Why unacceptable? As the runner of an instance I get to have control over my own little walled garden - it's literally the primary strength of federation. If anyone, at any time, is unhappy with the content moderation policies of the admins of their Mastodon/Calckey/Peertube/Lemmy/kbin instance then they are able to find a new home - or maybe start one of their own, like dbzer0 did.