Books are not banned, just not used in the classroom anymore. While the reasons for it may be wrong, it's something that happens constantly all over the world. No one prevents children or adults to read those books at home. Banning books could mean that owning them is illegal and that just hasn't happened.
https://www.virginiamercury.com/2022/07/06/free-speech-group...
Just within the last century it was illegal to send a copy of Ulyesses or The Canturbury Tales through US mail.