This is actually not true. Library circulation systems actively work to purge themselves of historical transactions, at least, the few I've worked with. If anything they keep the "last patron" for a given item for some time, in case damage is reported, but beyond that there is no historical record, to eliminate the possibility of searching that data via warrant or otherwise.

Oh interesting. That actually makes a ton of sense; the institution of libraries have been around for long enough to have the historical context around that. Maybe in a few hundred years, tech companies will be so wise.

More likely, the libraries will fall victim to the modern police-state attitude.

There was a Japanese novel called Library War that later got turned into a movie, TV series, and so on. The story took place in a fascinating if somewhat implausible near future where certain books were banned from the public, but libraries were exempted from the ban and could actually defend their rights under the exemption by any means necessary. This occasionally led to armed confrontations over the possession of these banned books.