Its just security theater as a theft deterrent. The idea is that if you see a screen with a green box around your face then you believe that they've got a good

Its just security theater as a theft deterrent. The idea is that if you see a screen with a green box around your face then you believe that they've got a good look at you and if you steal then they can use the images. Walmart isn't investing money building networked cameras with the processing ability to perform facial recognition at scale in real time. It'd probably cost more money than paying employees to just watch people at the store exits.