I have gotten my books all over the place. From Amazon, from Kobo and various e-pub stores (many now defunct), directly from smaller publishers, from Smashword, from Gutenberg etc. I put them all into Calibre and sideload them onto my Kindles, converting when necessary. I've never felt that I'm tied to anything, thanks to Calibre and Alf.
I cannot read fiction on a tablet or a phone, so apps are not an option for me. And I would hate having to use several different apps to read my books. Fortunately, I don't need to.
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