Indeed it needs to be fought.
I’m with @DougHolland@lemmy.world in that I oppose surviellance advertising anyway, so if the loyalty tracking were taking place without a special app (e.g. scanning a bar code from plastic/paper), I would still not register.
how to hit back (when there is a smartphone-free loyalty program)
In some cases we can do better than Doug. E.g. grab a paper loyalty application form (if they are available), scan the barcode or QR code, return the blank form to the top of the pile. Someone else will activate that bar code with their personal details later. You can regenerate the barcode, store it on your phone (which need not be subscribed to GSM service), or print it on paper, and use the barcode for discounts (& pay cash of course). You obviously corrupt their surveillance advertising DB and also get the discounts.
Win-win for me. But I guess it’s questionable to what extent the DB is being corrupted. My own purchases are still aggregated together which supports advertising. OTOH, it’s all aggregated to a different person, which to some extent corrupts the info. It’s unclear if this is overall more or less harmful to advertising.
how to hit back (when a loyalty program is smartphone-only)
Ideas? Perhaps we could create a barcode-sharing platform whereby some people take a hit for the team and register, then share their barcode for others. The volunteer would at least gain the benefit of their data being littered with data of other people.