A few months ago I decided on a whim that I should download and de-drm my Audible audiobooks. I have a lot of them from a decade+ of monthly credits being used. I hadn't really considered how much space it would take up so I just set off the download process and did other stuff. 650 audiobooks took up nearly 2TB of space before I stopped it, only noticing when my Mac gave me a warning about not having enough space left on the drive. Whoops. (Audible keeps track of your total listening time... It adds up to over 9 months solid. Crazy, but I can think of worse ways to spend that time.)
Anyways, if 6 million ebooks takes up 31TB, I wonder how much space the equivalent amount of audiobooks would use? And how much space a decent library of movies has? I'm kinda thinking that guy on reddit who somehow got a hold of a used Netflix edge server was on to something.