Comment That conclusion. (Score 4, Insightful) 23
This has typically meant that someone looking to buy an ebook reader has had to either fully commit to the Amazon Kindle ecosystem, or choose one of the many alternatives and stick with their choice, because ebook files they'd purchased or downloaded weren't cross-compatible.
Or you could, you know, use amzaon tools, or calibre, to convert from epub to mobi. Still, happy to have epubs in my kindle.