Humans could, yeah, it's just an idea. So if an image gets flagged as R or NSFW or XXX or something, users can upvote it on the block explorer to get the negative flag lowered. I don't know, like I said, just thinking out loud. a.i. is getting good, but it may take years before it is trusted.
That page that serves all the nasty imagery can be on a web3 domain, rather than an ICANN domain. Like BlurtImages.loki or something like that. There needs to be a way for the flase-positives to be reversed since a.i. isn't perfect yet and we can't hire some poor soul to look at thousands of nasty images all day, yikes.
I adminned a large gaming forum (150k active users) for quite a number of years in the earlier days of the internet, and one thing we noticed very clearly was that spam (and other unwanted stuff) encourages spam. Keeping on top of it meant FAR less work. Spammers (and people wanting to post illegal/nasty junk) will look for places that aren't being watched and enforced. If you're strict with the rules and get rid of garbage fast, you often won't have to do it again for quite a while. You get a reputation for somewhere that isn't good for spam, advertising, underage media, etc. It still happens, but far less often. I'm sure the same principle applies on a blockchain, although we now have to deal with more bots than we did back then of course. Point being though, if we get something set up, after an initial burst, it's going to be pretty minimal. A stitch in time saves nine.
I think this is already in effect here to a degree. We've kept things fairly clean, without impacting freedom of speech too much. We already aren't known as a good spot for illegal crap, drama, and other unwanted content. Hopefully that scales up as we grow : )