The store could gather how much time it took you to scan between items and in which order, but you can pay with cash if you're worried about personal privacy.
I've seen the kiosk system at Kroger in the midwest.
Sam's Club offers a mobile app scanner.
Perhaps it's just the places I frequent, but I've gotten to the point where I take them for granted. Keep an eye out for a kiosk that seems to be a kind of fnord. Check if your nearby groceries have a smartphone app that offers scanning via your phone if you're comfortable with that. The ones I've used worked fine, but I tend not to use the phone apps because I have a chronically low smartphone battery and storage space.