I recently went to London, where they have Amazon Fresh and Aldi using camera tracking technologies.  There are 5-10 cameras per aisle tracking items you removed from the shelf, and you just have to scan your credit card or Amazon app QR code to exit the store.   Staff said if I take an item and put it back on another shelf, I will still be charged.  My teenage son and I were stopped for checking at the exit because we walked past the alcohol aisle.

The store looks to have only 2 staff members.  Sooner or later, these technologies will land on this side of the world, and there will be more cameras tracking our every move.