The shoes have New Balance and Nike logos. AI would mess that up. The guy standing with his bag between his legs. AI wouldn't add that detail. Plus the guy behind him has blurry hand, I'm guessing because it was moving. AI image wouldn't have that.
Even then there were things that were more or less known in all corners of the Internet. You could mention things like SCP, 'Charlie bit my finger', or My Immortal on any forum and people there would recognize it.
Now it's all fragmented. Someone can mention something that's a massive phenomenon in one part of the platform and no one else on the same platform would recognise it. For example, I only recently heard about backrooms and apparently it has been a thing for half a decade. That's a long time in internet years.
Unlike groceries, you don't need to cook alcohol and clean the glasses when you're done.