Don't forget that Amazon can decide to de-sell you a book and it vanishes from your Kindle-for-whatever, and they say their "license" makes that "necessary".
Rather a long time ago, as such things are figured now, the first US pbook publication of the Lord of the Rings was, in fact, quite blatantly pirated. JRRT's lawyers went after the publisher, needless to say, and got the publication stopped. I believe they also hit up the publisher for royalties, though I don't know if those were ever paid. But at no point did anyone propose, nor would they have been taken seriously if they did, that they send out goons to buyers' houses to grab the books back from their bookshelves. The publisher screwed up, the publisher paid the bill, and honest buyers weren't involved. Now, the publisher screws up, the publisher may or may not pay, but the honest buyers get it in the neck. Why? Because they didn't buy a book, even though they clicked the "buy" button. They paid for a very limited, very restricted license to read that book, one that Amazon demonstrated that they could terminate -- and snatch the book right off the readers' Kindles -- any time they felt like it.