Can someone explain the SM photo thingies

so like, if I upload a pic on SM now, I know they changed it recently, but when I upload my pics they are almost immediately tagged as “non explicit” or like, nothing at all… this WOULD make sense to me except, they are immediately tagging my topless pics I upload as ”non-explicit“ so that doesn’t make sense. also, wtf is the difference between “non-explicit” and “sfw” and what exactly is the requirement for profile pics on SM now? I understood they were supposed to be “Sfw” but that brings me back to my last question about “Sfw” vs “non-explicit“ if anyone understands this and could explain, I would be eternally grateful! tyia!