You can argue until you are blue in the face about the legalities of it, but there is no denying Elfwreck's point about Amazon (or anyone else) not making it very clear what you are actually buying.
It is simply not clear enough that an ebook purchase is only a licence. If it was, there wouldn't be so many people wondering why they can let their friend read the great ebook they bought once they've finished with it.
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