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I read on a Kobo. I use their "not for Kobo" epub2 files. Occasionally I have to fix them. I do convert them to epub2 with some filters / settings I also use for Gutenberg.
A decently done epub works on any epub reader, any Kobo and "Send To Kindle".
A Calibre "Dual Mobi" seems to work on every kindle via USB (K3, DGX, PW1, old Basic, PW3, Oasis 2) all tested and is old mobi and azw3 in one file. A standard epub2 works on "Send to Kindle" or KDP, if it's done correctly.
I don't know why they give themselves so much work for zero value. It's 99.99% novels, not journals or text books that might need more complex stuff (and then a PDF serves best).
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