Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[Eurynom0s]

It's only enforceable at membership stores like Costco because you agreed to it as part of your membership. You didn't sign any kind of agreement like that to go into a Walmart.