YSK: You don't own your Kindle e-books.
This is not an anti-Kindle rant. I have purchased (rented?) several Kindle titles myself.
However, YSK that you are only licensing access to the book from Amazon, you don't own it like a physical book.
There have been cases where Amazon deletes a title from all devices. (Ironically, one version of "1984" was one such title).
https://www.nytimes.com/2009/07/18/technology/companies/18amazon.html
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.
Here are the terms of use:
https://www.amazon.com/gp/help/customer/display.html?nodeId=201014950
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.
Better to give to their patreon if possible. Awesome authors like Shirlatoon have them. Because, quite frankly, fuck the publishers too.
I'm subscribed! It's one of my favorite series. Also, The Mark of the Fool is another good series.
If you like HWFWM check out the Mayor of Noobtown.
Or The Wandering Inn. It's a slow burn, but it burns for ages.
Hwfwm?
He who fights with monsters.