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It is absolutely possible to use a Kindle without Amazon. You can convert Your books with calibre (kfx that requires Kindle Previewer, or azw3) and sideload them to Your Kindle. When my Paperwhite was my only reader I bought many books from other stores and I converted them into kfx. I was satisfied with my Kindle but I wanted something bigger, so I bought a Kobo Aura One.
About sending books to Amazon I did not use it very much, I learned to do it with calibre and I forgotten it because I did not need synchronization but I preferred a better typography.
If You like Oasis You won't have problems in using it also without buying from Amazon.
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