Mobi isn't obsolete. It is a perfectly good format for ebooks.
It seems that the only way to paint Amazon as a rebellious closed ecosystem is to continually narrow down the criterea every step of the way. One's preferences do not define the openness (or lack of) of an ecosystem.
There exists a way to read DRMed ebooks on the kindle that aren't purchased from Amazon. Therefore it is not a closed ecosystem. Amazon aren't responsible for the relative failure of publishers and bookstores to make use of that alternative.
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