When it comes to an eBook reader, the choices are limited. The market is dominated by Amazon’s proprietary Kindle along with a few other options like Kobo, Nook and Onyx.
An interesting news for open source enthusiasts is that a developer, Joey Castillo, is working on creating an open
IIRC it only suports plain text files / Markdown rn. Not supporting EPUB is a non-starter for me. I use my Kobo right now and love it. If they add EPUB support i will heavily consider building one.
I'm not sure I understand, epub is both the industry standard and an open format, as far as I know. Why not work on using it or build it around epub from the get-go?
I have to admit I'll have to wait for the project to start implementing epub to consider getting on board, but it's still a great effort.
DRM removal is not a feature of Calibre, but of plugins you can add to it. Kobo and Adobe DRM have plugins available. Amazon DRM plugin is in a poor state as Amazon cracked down on a major method earlier this year.
I also seem to remember there being another workaround, by exporting it to my old sony e-reader via the official sony app, which is so old it doesn't have proper DRM, but I did have to sign up for adobe digital editions or some or other BS. Something like that. End result was a DRM free epub.
Huge waste of time, especially for something I'd paid full price for, so after that I gave up on buying ebooks, and simply pirated them.
Just like with DVDs back in the day and streaming now, you get a shittier experience if you pay full price. Better to pirate.