Something big is happening, as Reddit seems to have purged literally every NSFW sub they know. Reason is always "unmoderated" despite some of the banned subreddits being fully moderated.
Edit: seems to have been a bug in automation (thanks @lefty7283@lemmy.world):
https://old.reddit.com/r/ModSupport/comments/1ii67mt/_/mb3fewv
It's still a good reminder on how quickly a community (or communities) thousands of people enjoy and in some cases rely upon can disappear.
Hosting NSFW content is an absolute ball-ache, so a lot of instances that are not NSFW focussed do not host it.
In the early days of feddit.uk, we decided to go the path of SFW, to simplify things.
I absolutely salute the lemmy-nsfw admins in taking that load on.
And it makes a lot of sense: If you're going to deal with the headaches, you might as well focus entirely on them!
As much as it sucks to say, it wouldn't surprise me if this stuff on Reddit is for the same reason.