Late to the party, but I think what counts as NSFW is also blurry and subjective. Like I have all NSFW blocked on my account, but the other day when I checked out the "All" feed, it had some pics that I would consider soft porn. Fully clothed subjects, but very much emphasising specific body parts in a sexualised way (I think the two communities I saw were midriff and thighs). I found them uncomfortable, but most people probably wouldn't call them outright NSFW.