Those of a certain age will remember the Coop "divi" and most will remember Green Shield Stamps. Both were an early form of loyalty card.
Nowadays loyalty cards are big business, and you, the holder, are the product. Every time you amass points on your card you are telling the store, what you bought, when you bought it, how often you shop, how much you spend. All that information is logged and a profile of you is built up.
But the really sinister thing is that copies of that profile are sold on and other profiles from credit, debit and mobile phone purchases are bought, to fill in the gaps. This is why there's such a rush to get us to a cashless society.
Corvid 19 has given a fresh impetus to a cashless society, have you noticed how the self-service checkout tills have 50% card only choice? You can catch the disease from cash, so we are led to believe.
For me, cash is king, but that's only because I can't have a sort of pay as you go card that can be topped up and I remain anonymous. We can't have that can we? How are we going to trace you?
By the way, I don't know if the Coop still have a divi, or a loyalty card but Green Shield are still around, they morphed into Argos.