It was said at one time that unsubscribing from special offers wasn't mandatory (PW2's had special cases or something? might be different for them) so I jailbroke a mid-summer 2016 new "basic Kindle" without removing the special offers. I don't use the jailbreak anymore (though it's still there) so I don't know if it hinders anything, in normal usage. But it didn't STOP the jailbreak.
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