University vending machine error reveals use of secret facial recognition | A malfunctioning vending machine at a Canadian university has inadvertently revealed that a number of them have been usin…::Snack dispenser at University of Waterloo shows facial recognition message on screen despite no prior indication
Marketing is often targeted, especially online (which is a huge privacy issue). I would guess they are using the data from these vending machines to measure the success of their marketing campaigns.