Analogously, terrestrial places that offer internet have behavioural restrictions on how they're used.

I can imagine a number of things that can kicked you out of coffee shops that have guest wifi. Since it's a private business, that doesn't bother me on principle.

Libraries are often pretty open about what they allow, but the one at my university had a policy of "porn is fine unless other patrons see it and object." I find that policy to be incredibly reasonable.