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I'm not sure where you're located, but I find that hard to believe for the US. My library has an app which is obviously storing data about me on a server somewhere. They certainly know which books I have out now and which are overdue.

This is at least common in US libraries. The San Francisco public library as well as the library system where I grew up both do not keep library records after you have returned the item. I know there is a lot of contention about their private partners keeping records (ex: Overdrive) but I haven't followed that conversation much.

Source? I've heard of librarians fighting government agencies demanding access to their records, but it's pretty obvious that my local library keeps track of what I borrow.

here is an example: https://sfpl.org/about-us/confidentiality-and-usa-patriot-ac...

"The Library does not maintain a history of what a borrower has previously checked out once books and materials are returned on time."

When did this change? When I was a kid, the books from the public library had a little card that had the previous borrowers crossed out.

In Poland - they do keep track.