I thought they were destroyed just because they rip out the spine to scan them more easily?
No, the core problem is that keeping a scan is legal if and only if you destroy the physical copy.
It would have made more sense for them to be required to store, maintain, and never sell the original.
What if taking the first picture of the Mona Lisa required it to be destroyed?
"Do what they ask for but do it so badly that perhaps some people start asking the right questions"