They are destroying them because it’s easier to scan them if you slice the binding.
I didn't fully understand why but apparently there is also a legal reason to destroy the books, it makes it them less likely to be considered copyright infringement.
And very hard to re-assemble after you have done that. They are not in the book binding business.
I didn't fully understand why but apparently there is also a legal reason to destroy the books, it makes it them less likely to be considered copyright infringement.