Amazon Go's model is "Extreme Loss Prevention" - have no checkers, monitor all customers, and just charge their account for what they "shoplifted".

Amazon Go stores are classist and ageist in a different way than traditional retail, because they effectively ban customers who don't have an Amazon account, or don't have a bank account backing the Amazon account, or don't have a smartphone. My parents couldn't shop there because they don't want to use smartphones.

Supposedly, the machine-vision and algorithms aren't quite there yet, and the stores depend on a very large human element behind the cameras.