Unfortunately I don't know any numbers re theft, but it's still running 5 years later. Of course being in a suburban area helps.
I think this is how all Alberstons-owned stores work, because I’ve seen it an Randall’s and other places, but until now could avoid shopping there. I always wondered why Walmart said “everyday low prices”, because isn’t that normal? Well, apparently not.
JC Penny famously tried to get out of that and it almost killed them: https://www.forbes.com/sites/panosmourdoukoutas/2017/02/24/a...
Walmart (and Costco, and Trader Joe's, and a few others) are so large that instead of making you dance around with coupons and such, they just tell the company to give them a discount and pass it on to the customer. An item at another store that needs a store app, coupon, etc, will just be dropped the same price at Walmart I've noticed.
(I hate the Kohl's style, as even when I stack coupons and get to 75% off on clearance, I still feel I missed something and got cheated. But apparently lots of shoppers really love that kind of "bargain hunt".)
Supermarkets are now grudgingly admitting that self checkout systems cause a significant increase in loss due to theft, but that it is still cheaper than hiring actual staff for the registers.
In the Netherlands the current state of affairs in supermarkets with self checkout registers is that theft is on the up. People justify 'forgetting to scan an item' by the (perceived or actual) greed shown by supermarkets in terms of shrinkflation and the rising cost-of-living. Supermarkets did really well during the Covid-years, but customers didn't benefit from that in the slightest.
An additional problem is that the staff attending the self checkout registers are often young (because it is a position which would waste the skills of the more experienced employees), and they get bullied and berated by customers pissed off for getting selected for random (either actual or directed by the staff watching the cameras) checks.