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.