[mattmanser]

You use your reward card when paying with a credit card? Or have you only ever paid cash?

Because if you have, your reward card has probably already been linked to your credit card, phone number, email, etc. by now.

[slaymaker1907]

That at least takes extra processing and data sets. I think that does matter as far as privacy is concerned. We tend to think of privacy and security as all or nothing, but it really doesn't have to be that way and may be impossible to achieve if you go down that route.