There have also been cases where a customer violated Amazon's terms of service and lost access to all of their Kindle e-books. Amazon has all the power in this relationship. They can and do change the rules on us lowly peasants from time to time.
Note, there are indeed ways to download your books and import them into something like Calibre (and remove the DRM from the books). If you do some web searches (and/or search YouTube) you can probably figure it out.
I know that would allow you to back up the ebook file elsewhere and use it however you please, but could Amazon still potentially delete the file from your Kindle device?
You can put unmanaged files (in a readable format) onto a Kindle via USB, though, so if you’d backed up the file somewhere you could presumably put it back again manually.
A "DRM Free" kindle ebook still basically requires a physical kindle (or shenanigans with apps) to even access the raw file of. If you just go to your content library to try and download it to transfer via USB you get told to pound sand and buy a kindle. That might change if you have a physical kindle registered to your account (I currently read exclusively via my phone and my onyx boox) but... yeah.
And yeah, as long as it is in The Cloud, amazon can do whatever they want. I am not aware of having any books removed from my account but I do recall having the option to "upgrade" an ebook to a newer version in the case of publisher screw ups.
Yeah—I finally got a physical Kindle in part to simplify the process of downloading and backing up my ebooks.
To be fair, though, their devices and apps have mutually-incompatible file formats, so if the only point of downloading a file were to put it on an offline Kindle via USB (which is the only use case they acknowledge), they’d need to know what device you’ve got so they can convert the file to an appropriate format.
My understanding is a lot of those were just wrappers for mobi files to add even more drm, but I haven't looked super closely.
I dunno. I used to be super hardcore about ripping every book and putting it in my calibre library. Then I eventually realized that... mostly I don't care. There are very few books I am going to re-read and the majority of those were so good that I either want the hardcover to put on a shelf or don't mind buying again from a vendor that gives the author a better percentage.
Yeah. In my case, though, a lot of my library consists of relatively expensive reference works that I use regularly and that would be prohibitive to replace if Amazon decided to play games with them.