Nobody with sane mind cares. You may buy Kindle, but then you jailbreak it right away. You can "buy" Kindle e-books, but then you exfiltrate these right away. When you stand your ground, what can Amazon allow you or not allow?
Sure, if you don't mind playing a stupid cat and mouse game with one of the largest corporations on the planet, go for it. I did it for a bit and got real tired of the drag.
Now if a book is available from a DRM free source, I buy it. Otherwise something else
Hardware I pay for should be mine. If I do not jailbreak it, it is still theirs, despite me paying for it. They cheat, not me. Same goes for e-books, they can cut me off, they can (and do) change contents on the fly. I keep exfiltrated books for myself, and that is right.