I don't use cash much, but this is still pretty creepy
I don't know the details but for sure your data is shared in ways that you don't suspect.
For example:
-Sometime around the Patriot Act I remember an insert in my CIBC account summary that indicated that CIBC would be compliant with the Patriot Act as a company that operated in the USA. What did that mean ? Who knows.
-Our security agencies are part of Five Eyes so they share it anyway, if you're of interest to them or maybe not
-Privacy vs. Secrecy - two sides of the same coin. Openness kills both. I'm still not sure if the social utility of privacy is being adequately considered on the whole.