Idk it was like 2 years ago. I just remember looking through fediverse guides and instances were labeled as either allowing NSFW content or not, no nuance. I didn't dig into whether the specific instances were defederated from lemmynsfw nor did I even know to look for that at the time.

There's not that much NSFW stuff that isn't porn but I come across it occasionally. Usually jokes, sometimes people will also be very cautious and mark shit that isn't really. I prefer to be largely unconstrained with what comes across my feed, just don't care for the random puss intermingled.