And they should not even be needed. In many places the issue is solved at start. Copy or copies of each commercially produced book is send to national library. Which with tax payer money keeps an archive. Meaning that at least one copy exist for research purposes if needed.

Unfortunately, that's not the case in the United States. The LOC only selects around half of published books to be permanently held. The rest are disposed of (usually returning them to the publisher, donating them to a library, or destroying them).