Sorry, I wanted you to expand on this: "cashiers recorded buyer demographics by hand".
Give me an example of what they used to record by hand. All I can think of is "male, adult". I am specifically interested in what else you say they used to record.
I wasn't asking about the present status quo, only your historical statement about cashiers recording by hand.
Thank you! Obviously that is far less privacy violating than demographics could be.
Today advertisers that phone home (spyware) often lie and claim only aggregate data is produced - but this manual example really is the kind of data that is okay. It's far less detailed than something like facial recognition. Thanks for adding the link!
Give me an example of what they used to record by hand. All I can think of is "male, adult". I am specifically interested in what else you say they used to record.
I wasn't asking about the present status quo, only your historical statement about cashiers recording by hand.