The bytes were copied thousands of times. That means they made thousands of copies. It doesn't matter if the UX describes a concept of 'a digital copy' which requires that a new copy not be made until the old copy is deleted; copyright law does not say that this exempts you from the usual rule against making unlicensed copies. What you are thinking of, where you own 'a digital copy' of a book, is owning a license (as you have checked an 'I understand' box about a dozen times), not owning a copy. IA does not have permission to sublicense copies it legally owns (and didn't legally own the digital copies to start with, as their purposes weren't within the §108 carveout).