And that’s why they get ripped off by ubereats and other delivery services. They will outsource their whole ordering process and lose almost 30% of their margin because they can’t be bothered to have their own app or a proper website.
Restaurants are just not tech savvy. It’s just a common industry trend. Sure you’ll find exceptions and may be someone will track you with a QR code. The reality is that they won’t.
They’d get a lot more info from you if they had a free wifi anyway.