Which is why I try to decrypt everything I purchase, or obtain a decrypted version after purchase. (The only grey-area exception is if I own the physical copy of the book, I consider it ethical to download the ebook, but this is of course debatable to a degree)
I'm not trying to screw over authors and publishers, I just want to use my purchased content how I please.
They could easily do what Apple did and leave things un-DRM'd but digitally-signed as having been purchased by someone.
Buying hard copies of a book and the pirating the DRM-free digital version is completely acceptable imo - as long as you buy the hard copy in a bookshop and not online ilk like Amazon.
Most local bookshops also will offer shipping if you’re too lazy to walk there a couple of times/year.
It's a shame they haven't tried to pressure the publishers into dropping DRM for books.
The DRM used by Apple's bookstore is entirely limited to Apple's own apps on its own devices. You can't even read the books in a web browser.