In retrospect all the ebooks I bought were a waste of money because I can't get them off Kindle easily, if at all, to digest via an LLM.
There may or may not be easily findable plugins for [popular ebook desktop app] to remove the DRM.
I buy ebooks, remove DRM, and store them on my network storage drive so I can read them on any device I own.
The simplicity of the approach seemed pretty awesome