I live in China and here's an anti-anecdote. I had a terrible QR code menu the other day where you'd sit down, order, but there was no pay button. This set of my alarm bells immediately. And indeed, for a dinner that was supposed to be around 200-300, we wound up paying nearly 100 in additional fees that were mystically added to our apparently open bill without declaration. I complained about this at the counter when leaving and they refused to engage. The food was bad too, it was clearly a scam. I left them a terrible review and immediately decided never to dine at a QR code menu only restaurant again, and have so far stuck to my guns. Incidentally, I also work in foodtech.