I hate where this is going, but accept that it is inevitable. As much as I value my privacy, I've well and truly fallen into the trap of using tap and pay with my phone. I don't think I've carried cash in any meaningful quantity for years now.
Maybe it could be nationalised though, in the same way that currency is nationalised. That way the costs of managing it could be part of our way of life, not by a specific bank, or that datra being sold to various thrid parties.
Welcome to the Australia community. There is nothing wrong with disagreeing with people, however it is clear to me that you are just trying to have a go at the ABC (as you have done previously). If you want to do that don't do it here - or if you do have some evidence that cash use is actually increasing in Australia feel free to post it.