@Qwant like this creepy coffee shop? https://www.npr.org/sections/thesalt/2018/09/29/643386327/no-cash-needed-at-this-cafe-students-pay-the-tab-with-their-personal-data

@Qwant that already happens. It's called loyalty cards. You get a discount, the store can target ads to you and sell your preferences.

@Qwant Already does; has for some time. Most major food retailers off phone apps, too.