The existing guidelines are the default. It definitely needs to be updated.
I think relying on users to censor content is an unsustainable headache. I remove ~20 NSFW images per month from Discord that are posted in SFW channels. And that’s with places that are explicitly and visibly marked as NSFW. I think in a forum format it would be a lot worse.
@feederbox826 idea is not bad. It removes user error element, while not adding too much friction.
I added blur globally for the moment to see how it feels.