reddit did have problems with that in medical subs. i dont think most of them are heavily moderated(i think there is more moderation now) because minors were being contacted by perverts to show them more. and some users were shocked that there was a part-time teenager modding that NSFW sub, also theres significant amount of self-harm glorifying posts too. the 2 subs i know that are very restrictive is askdoc and dental on what you can even comment or post.