If you required a high accuracy like 99.9% to charge a customer, you could have a system that was mostly automatic but still needed human review when the model isn’t confident enough. It’s hard to know exactly what this means without a lot more details, which Amazon is unlikely to provide.

Wonder if that 30% include the cases where someone walks in, strolls around, and walks out without buying something? Which I see people do all the time, interested in the concept.