The thread is about terms of use separate from copyright law. It is the whole premise.

You do not have a contract with the publishers of the book. They are visibly asserting their copyright to deter any defense of ignorance or implied grant of rights to an infringer; but that's not a contract, you did not agree to it before purchasing, there are no contractual terms (scope, duration, faults and compensation, resolution etc.) and nothing in it exceeds the limits the copyright law already sets.

For example, never will you see printed in a book something like "this book is for the exclusive use of the purchaser and you cannot lend, resale or otherwise make available to other parties" - if such a thing was possible, like most software EULAs do, publishers would be all over it.