Many NSFW have nothing to do with porn. Sometimes are horror contents, some times are crude images, some times are just lazy people who don’t know of the Spoiler tag. Can we have a quick and easy way to filter off all the (very funny but not alway wanted) Porn posts without locking out those other contents???
I don’t think ActivityPub supports that. There’s just the “sensitive” flag (which Mastodon shows as a content warning and lemmy shows as NSFW). I think you’d have to do something outside of the specification.
Which only means that you have to add it to activitypub first.