I think if you connect your prime video purchases to something like Movies Anywhere or vudu/fandango, a lot of them transfer over so I think in theory you could delete your account and keep those purchases elsewhere but I’m not 100% on that. But this is one of many reasons why I’m a huge supporter of physical media.
It’s very good. Interesting to read it now in 2025 though and seeing how the things he talks about in the book are seemingly worse than they were when he wrote it. So, I do think a warning is fair that it is not exactly a pleasant read. He also does a good job prefacing the book to let you know this, though.