Cashless, Bitcoin and the Devil walk into a bar ...
(media.communities.win)
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If they wanted or needed tracking, they would use this method. But they really won't need it because when you go to the grocery store and pay with cash in order to be anonymous, the stores cameras will track you everywhere you go, then you show your member card to save $0.16 on that $100 purchase which basically connects your identity to the transaction.
Simply put people are stupid, and no matter how anonymous or privacy oriented a medium of exchange is designed to be, it means nothing if you don't protect yourself from all the other surveillance mechanisms.
You're not wrong.
I used to join the "store club" and then swap my card with someone else, and then swap their card with someone else (and encourage them to do the same) on a regular basis.
Cameras and phones make all that futile nowadays, but cash will still keep them from getting an accurate buying profile, at least until accurate facial recognition.
The Hong Kong folks came up with glasses that had frames with outward shining IR LEDs that blinded the cameras, in addition to using umbrellas outdoors.