Imagine if, the day they closed their doors for the pandemic, all the libraries figured that access to knowledge is still essential and the best way to keep loaning books is digitally. So the libraries mailed all their books to IA on loan, or maybe they digitized them themselves and loaned copies one-for-one to IA. IA would then have more than enough copies to lend out, one at a time per physical book like normal, to everyone who's needed them.
The books exist, they're just behind closed doors now.