All true but at the end of the day, just buy a physical copy to support the author ,download the ebook from libgen or whatever and just use the kindle as hardware. In some way I admire people who try to abide by all the 50 pages of legalese you're forced to agree to but I couldn't be bothered with it. Especially all the books she lost that were associated with the account. If anyone had bought something from me once…
If you're downloading from libgen anyway, you might as well buy the kindle version to support the author, instead of the dead trees. Or any other ebook, or the audible.
Cory Doctorow actually had a system for this for his earlier books for matching teachers who wanted hardcopies of his books and donators who wanted to "pay" Cory in some way [1].