Most of the restaurants I've been to the QR code takes you to a PDF of the menu as found on the restaurant's website. There's no auth and no way to track anything beyond I guess how many times people opened the menu file. Restaurants aren't doing this for tracking, they're doing it to stay on the good side of public health regulations in a period where they've learned they can be forcibly closed with barely any warning.

Orders are typically stored anyways?

But not how long you stared at the deserts, or what side of the "give me lobster" button you pressed.

Maybe eventually; I haven't seen a PointOfSale system that worked remotely well enough I thought they could be competent to implement in a useful way.

I tend to not jump to malicious that can be attributed to virtue signaling and/or incompetence.

Meaningless and trivial metrics, ultimately. Third order at best.

Probably, but it is still data that is cheap to store. IF someone can find something useful in just 1% of those things 10 years from now all the cost to collect and store all that data will be worth the investment - or so they hope. They probably will too - the cost vs reward is very skewed.