Various megacorps own the copyright of those books, and internet technology threatened to make them poor and sad by ending their power to create artificial scarcity of knowledge.

So the State had to step in, and mandate that libraries need to "repurchase" the licence for the book after a certain number of people have read them.

Archive.org fought them in the courts, and lost hard.

Libgen.rs and sci-hub.se fought them by being on the Dark Web and in Russia, respectively. That's working pretty well!