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Perhaps I'm old fashioned but I would not expect a restaurant owner to track where I come from, my demographics etc?

Restaurant owners do exactly that - just by looking at you sitting in there (and other customers).

not my underwear colour, type, size. What they see is what I offer to show

They wouldn’t have to “track” it scientifically in a database.

They would just know implicitly by observing their customers who are right in front of their eyes. (At least pre-covid)

would they know which car I drive from looking at me?