There are tons and tons and tons of books on the Kindle not available elsewhere that are not independent, too.
Exclusives are just that, exclusives. Plenty of ebooks are only on the Kindle, but they don't HAVE to be only on the kindle.
If you read a certain type of book, almost any store will take care of you. I, for one, can pretty much only be served by the Kindle store as no one else has hardly anything I'd buy.
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