Earlier quoted context omitted.
2040 startup idea: body-identity-based micro-credit. "You forgot your wallet, but you look fairly legit. For a 5% surcharge, we'll give you that coffee now. Pay this IOU online later. In case of nonpayment, you consent to nationwide tracking by our network of facial recognition drones."
... which sounds pretty close to Amazon's idea. http://www.huffingtonpost.com/entry/amazon-go-grocery-store_...
Do you think they contemplated doing visual ID of the shopper, or would it just be too creepy to walk into the store and have it say "Hello Dave, I'll put it all on your tab!"