I dunno man. I think that they are the lexicon of iconic footwear, and so are, in fact, copied pretty much everywhere and by everyone. It's just that Stans are having a moment. Not that long ago, no one cared at all about Stan Smiths. The model wasn't even made for a while. It's like mocs and boat shoes. They are all over the place now. In the 90s, it was all doc boots and you couldn't pay someone to wear moc styled shoes.