A grocery store near me has the self-scan as part of the app. It’s pretty good, but honestly it’s not that bad to do a full trip through the self checkout.
Wegmans tried that at first but failed and removed it. No one wants to scan products with their phone while shopping.
Oh dang, I love it. It’s awesome to be able to see what my total cost is as I shop. I definitely buy less when I do it that way, and added bonuses include everything already being bagged the way I like it and not having to talk to people (at least usually). I did it all the time during the pandemic.
The only thing is that I wish I had something other than the phone for the scanning. Using the phone camera to scan isn’t anywhere near as fast/good as using a scanning gun.
But my guess is that it got removed because too many people were “scanning” and just taking off. It’s pretty easy to fool self check, but enough people will avoid trying because there are people there, cameras, etc. Pretty hard to get that coverage on the whole store.