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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.
Kindles are cheap. That's pretty much it. I don't think it's a great mystery. Amazon subsidizes their hardware to get you into their ecosystem even more.
They also consistently put their ebooks on sale. I've gone cold turkey on buying from them and have noticed they often have the best prices on books. They want people to build a library and be locked in.
Maybe my different experience comes from living in the global south. All of the are expensive in here, so kindle has no price advantage
Prime Day and other sales push those prices down pretty regularly to the point I think most people are like "ah fuck it why not" and just grab one