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A college is removing its vending machines after a student discovered they were using facial recognition technology
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
That's not how this works. The most likely use case is using a picture of your face, letting the algorithm run (which then finds out if you're male, female, roughly how old) and then they throw the picture away. The actual collected data is anonymous, so if they did that it might even be GDPR compliant in the EU (otherwise they'd break several laws).
There really is no value in having a picture of your actual face, it's just a lot of trouble in waiting.