I don't really understand this argument.It's the slippery slope towards ID cards.It's a nope from me.
Most of us have phones, and use our debit card all the time.
Whoever cares, knows where we are, what we spend , where and what on. I daresay they can see what we are up to on our browsers.
Unless we are up to much badness, I can't see who would be interested. By the same token , those that want to cause us or our loved ones harm, are more likely to get caught.