One of the "perks" of my Walmart+ membership is scan-as-you-go. I think I've used it twice. Both times, I only had a few things and the store was packed solid with spring breakers. It was a decent experience but I still like the normal self-checkout the best.
US side Sam's Club (same Sam Walton) has scan-as-you-shop.
Membership clubs can get away with quite a bit more because they're controlled access.
I notice Costco has self-checkouts now.
So does Walmart+ (the membership program which also gives a better deal for home delivery). I am curious whether this is going to stay or not, now that in some Walmarts the self-checkouts (where you're still obliged to stop and scan a code to complete checkout) aren't open normally.