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
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Consent is a requirement for GDPR compliance. They are likely taking an image from the camera, extracting semantic attributes from the image, and then discarding the image. The length of time the individual is standing there making the purchase is likely longer than the image is stored in memory while extracting the attributes.
I bet there is no button “consent to biometrics collection”