That sucks and all, but to be fair this is entirely on you. They sold you a DRM-Free file and you chose to not actually use it and to rely on their servers which you have no control over. This isn’t a “DRM Free” issue.
Personal ownership means you take personal responsibility for it.
Any real benefits of jailbreaking a Kindle? I mean I know the “You free yourself from amazon!” elevator pitch, but what exactly does that mean?
I can already upload pretty much anything I want to it with Calibre. Can I add support for other ebook formats? Cooler utilities on my Scribe? Alternative ebook stores (yes I know where I am)? A user interface that isn’t absolute garbage?
Qobuz and 7digital have pretty good libraries and high quality downloads.