OTOH, I might very well want to take a screenshot of my own bank details, transactions, or other sensitive information. It's annoying that my information is being protected from myself.

You might have amazing operational security but lots of other people don't, and they make noise, which means governments write laws meaning that banks have to refund them for fraud.

So as much as a bank might agree with your stance on freedom of compute - they probably don't want to pay for it with actual money.