Thinking of moving to sh.itjust.works from lemmy.world - one question about the rules though...
If I post nsfw onto a community hosted on lemmynsfw, for example, from the sh.itjust.works account, would that breaking the no pron rule, or not necessarily, since it's posted on a different instance?
It's fundamental to the design of Lemmy's implementation of federation via ActivityPub that all content from an account be hosted on the account's instance.
If it's an ActivityPub feature, this is somewhat of a poor design if you ask me (or at least not being able to change this). He's right, this feature could put instance owners in legal problems, because the data in question is actually stored on their server, not the server that you posted the image on.
Indeed, this is a huge design flaw. You would basically have to police everything that users post on other instances as well. Do you even have moderation tools for this?
I really have no idea how other instances actually confirm that you're posting from another instance, not just emulating that you're a user on another instance. That might be a part of ActivityPub, but I haven't looked at code, wouldn't know.