Earlier quoted context omitted.
Supermarkets used to have coupons that you had to cut out of the paper to get discounts on certain items. That was already bullshit -- if you can sell it at that price, please sell it at that price! Why the extra hoop of cutting up a magazine first? Then supermarkets discovered bar codes. If you can convince people to carry around a barcode, suddenly you can track their usage patterns in exchange for a small discount…
Consider asking a cashier for a new membership card and take the membership form home but never fill it out. Why give a fake name when you can give no name at all? The loyalty card still works, and a usage pattern is tracked, even if not necessarilly tied to an identity.
huh? at least in my supermarket it doesn't work, unless you activate it, the new thing being that you can't do that anymore without installing the app. Not sure if that was unclear in my story.