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Amazon is making it impossible to remove the DRM from Kindle Books
(goodereader.com)
This is a most excellent place for technology news and articles.
I'm sorry but the idea that most ebooks are exclusive to Amazon is absurd. While they are trying and would love that to be true, it's just not.
That was my first thought too, but I'm not so sure. I'd love to see data on it. I did a quick search and couldn't find any numbers, but I did find articles talking about Amazon requiring exclusivity in some cases. https://www.ingramspark.com/blog/amazon-exclusive-options-createspace-kdp-select-and-acx
100% they have pressured some smaller publishers and authors into exclusivity, especially self published authors that use their print on demand services. But most books you can find at competing digital storefronts.
I hear what you're saying, but I'd still like to see numbers before taking a stance.