Another nice benefit of paper is that the company that sold it can't just bust down your door, steal the book, drop off a few bucks, and then go back along their merry way. Amazon did exactly this with, amongst other books, 1984. Such a perfectly appropriate book.
If someone a) finds my calibre-web installation on the public internet b) manages to crack my username and password to log in c) scan the contents d) notify the correct rights holders e) send a subpoena for pirating content
Accidentally? My calibre-web is actually exposed online :P
It doesn't list any books that I have publicly though. All you'll see is a login prompt. Books? what books? You can't DMCA me because I only have gutenberg collections in there ;)
You've got to wonder what the hapless Amazon employee asked to implement this felt, and how much leeway they had in which book for that to happen to first.