Re:#4 i know of no reader program that lets you modify the existing book text.
Dictionaries are problematic because there is no standard for ePub dictionaries, as opposed to .mobi dictionaries, where there is a standard.
I don't think that Amazon is a monopoly. If they were, Nook would not exist, nor Kobo.
IPad is not a monopoly because you can use reader apps from anywhere on it - Nook, Kindle, Goodreader, dozens of other reader apps that aren't associated with a store.
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