Earlier quoted context omitted.
You can have valid reasons to want to hide legal purchases. Alcohol is a legal drug, but how will you feel when your credit card company sells your purchase history to some analytics firm that deems you high risk for health issues, sells that data to your insurer, and your rates go up? When I go to a bar or a McDonalds I pay cash for this reason.
> how will you feel when your credit card company sells your purchase history to some analytics firm that deems you high risk for health issues, sells that data to your insurer, and your rates go up? I feel confused that you have this very accurate description of a problem ("companies sell your personal data") and your solution is "we must hide from the companies" instead of "we must enact laws to restrict dealing in…
Facebook used contracts instead of technical controls to protect data, and we've seen how well that worked :)
I'll admit many on HN are obsessed with overly technical solutions, but "using cash" seems much simpler than "establish a complex regulatory regime".