[OrsonSmelles]

There's probably a legal distinction, but personally I really don't want, say, my grocery store tracking how long I spent in which aisles to add to my advertising profile.

(Yes, I use rewards cards, but I have the option to not enter my phone number and pay cash if I want to exclude a particular purchase from that dataset.)

[godelski]

FYI with a lot of rewards cards you can just get the card and then do nothing but just use the card. Don't install an app and don't add a phone number. I've also been successful using fake phone numbers, even 555 ones.