The banks have created this mess for themselves over decades of digital banking.
If they can't keep their stuff secure, they're doing it wrong!
As per the Amazon middleman article, banks are another middleman increasingly fighting for relevance.
Let everyone use Bitcoin (as an example) and the banks need not exist for most day to day banking.
Giving them taxpayer money, and having tax funded gchq protecting their monolithic out dated and vulnerable systems when they need not even exist for many is a waste of our money.