Never! The Kindle KDP program is a blemish on eBooks. It keeps them locked away from those who don't buy Kindle eBooks. Buying them tells Amazon that it's a good thing to do when it's actually not a good thing at all.
If you have a Kindle, you didn't remove DRM and you didn't format shift, you would not be happy if you found eBooks you want in ePub but were unable to read as you want. This is what the KDP program does to a lot of people who do not read Kindle eBooks.
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