What service? The social media regulations I recall seeing have a size threshold, so hobbyists don't seem relevant. For something like porn, after having actually thought about it some, I don't really see how we've decided that anonymous porn isn't blatantly public indecency, so frankly I don't see how hobbyists openly sharing their work with anyone without knowing who they're giving it to wouldn't be committing a crime.
> I don't really see how we've decided that anonymous porn isn't blatantly public indecency
That one seems pretty obvious. The point of public indecency laws is so that your family can go to McDonald's and not encounter some couple fornicating on the table. Whereas if you go to a private house where someone lives with a reputation for not being very selective about who they take their clothes off in front of, that's not a public establishment.
A privately owned PC connecting to a privately owned server is a private connection, not a public place. It's something you get by going there. You're not required to go to the frat house.