Book publishers have definitely tried to fight libraries before though, in the past couple hundred year history of libraries. Buying a book and then loaning it to _hundreds_ of people who would otherwise have bought it themselves was viewed as stealing from publisher/author profits. I think in some/many countries libraries still actually pay licensing fees to publishers? (similar to what/how radio stations do in the U.S.). The "first sale doctrine" that's part of copyright law in the U.S. says once you buy a book you have the right to loan that book out, give it away, resell it used, or even lease it out if you want -- but the first sale doctrine is particular to the US.