I'm not sure how much of a big deal this is in practice. Amazon's KindleGen tool was never open source, and Kindle-specific book formats are proprietary. And, w

I'm not sure how much of a big deal this is in practice. Amazon's KindleGen tool was never open source, and Kindle-specific book formats are proprietary. And, while this is admittedly anecdotal, I don't think I'm going out on a limb by suggesting that Linux users tend toward the, hmm, opinionated when it comes to certain things, licensing chief among them. Dollars to donuts that out of the "Kindle books" generated on Linux, a substantial chunk were created as ePubs using open tools and either converted to Mobipocket using Calibre or a similar tool, or just handed off to the publisher directly and converted on their end to Kindle. All of those workflows are still available.