Just over half of Amazon Fresh stores are equipped with Just Walk Out. The technology allows customers to skip checkout altogether by scanning a QR code when they enter the store. Though it seemed completely automated, Just Walk Out relied on more than 1,000 people in India watching and labeling videos to ensure accurate checkouts. The cashiers were simply moved off-site, and they watched you as you shopped.
Probably schools tbh, there have been a lot of papers floated about using a camera and AI to tell if students are paying attention or cheating or whatever. There's already exammonitor & others using webcams so it's not a huge leap to make.