Except that cameras in stores have been used for anti-shoplifting for decades. They've been used for more subtle things like monitoring tables at casinos.
I mean, I'm just asking the question how people know for sure Go isn't (at least partly) a Turk. It seems like an obvious thing to ask? But I first came to wonder if there's manual component involved after shopping a few times at Go. When it was busy, it took sometimes well over an hour to get a receipt. When it was empty, it was immediate. How come?
Also, the accuracy is completely anecdotal both ways... at least one person I visited the store with never got billed.