Sounds like there needs to b e a class-action lawsuit over this.
It is one thing to declare that they will no longer offer a particular product.
It is another thing entirely, to take a product away from a consumer who has rightfully paid for it. I cannot think of any way for this to be considered legal or ethical; for it to be construed as anything other than theft and fraud.
People are writing that it's an issue of what exactly is defined as "ownership." Digital books cannot be given away (except in certain ways Amazon has carefully structured for marketing) or resold already, unlike books-as-objects. So this is another way in which digital books are not quite like codices you can hold in your hand.
But no, I am not satisfied with what is going on here. It was a perfectly good book, by a Canadian psychiatrist if I remember correctly, I read it and gave it a good review (gone now, of course). He made a calm case that people who think they are a different sex than they are and work hard to mutilate themselves are delusional in the same way that many people are about other issues. Fixed delusions are a major psychiatric problem, after all. Stalkers who hunt down and kill famous people who are "really" in love with them, they say; paranoid psychotics who think aliens are beaming thoughts into their heads; these are all delusionals and have pretty much the same fierceness of delusions as men who keep getting more and more mutilated and poisoned with drugs and hormones in their unceasing quest to turn into women. Which, however, they never can, just as the stalker doesn't really have a lover in the person he stalks and usually eventually tries to kill as punishment for frustrating him. People can go a long, long way from reality when they start making up their own truth without keeping a foot on the ground to check if any of it is real.
Fine, trannies are psychotics like other psychotic delusionals. It's a common type of serious mental illness. I don't want the society to force me to pretend that what isn't real is real after all. This digital book-burning by Amazon is a very ominous sign of things to come.