I'm curious why conveyor belt type systems (like the ones at airports) with vision based checkout aren't a thing. Multiple camera angles could prevent customer

I'm curious why conveyor belt type systems (like the ones at airports) with vision based checkout aren't a thing. Multiple camera angles could prevent customers from trying to sneak stuff through. For additional security some sort of turnstile could be added to prevent the customer from access the groceries until payment has been verified. Computer Vision Approach to Cashierless Checkouts https://www.youtube.com/watch?v=lEWFmKI5RYY https://www.youtube.com/watch?v=lEWFmKI5RYY Twinflow Live in Store https://www.youtube.com/watch?v=L3eBbZ_Zt1c https://www.youtube.com/watch?v=L3eBbZ_Zt1c The floor area would be larger than a self checkout station but the throughput would likely be much higher and be a better customer experience. Self checkout stations seem much more amendable to casual shoplifting since its hard to see what the customer is doing.