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i’ve seen such systems all across europe. they’re as illegal as cctv, i.e. not at all.

Digital? Check! Processes? Check! Personal? It's your #*%$ing face!

I'm pretty sure the GDPR has some interesting things to say about digitally processing personal data without informing you.

CCTV is allowed if used exclusively for security purposes (Art. 6 (1) (f)). These devices are not equivalent.

Why would it be illegal in Europe?

Of course they will be racist and sexist... they'll probably have a log of race and sex of those they see. That information is probably useful to know your customers and learn what to sell; it seems useful.