[Arnt]

The general public is not required to keep the goalposts still.

The organisations that set up the system surveyed the public to learn why >80% never started using it and the users dropped off. The common answers included things like "can't see my own recent activities", "can't see how much money there is on the card" and "adding money to the card is a hassle", all of which were truish and IMO were side effects of features intended to make use of the card untraceable.

If you can't deliver a realtime feed of the transactions anywhere you can't deliver such a feed to your own smartphone either, see? And if you could deliver one to your smartphone, the system could also deliver a feed to other authorised destinations, and what's authorised, exactly? Can the card be traced to an authorising party? If not, how can you ensure that the destinations receiving a feed a really authorised? That kind of thing.