But the thing is, Apple isn't doing anything better for the consumer of ebooks than Amazon is, if you take the tack of "Amazon is the only thing that's bad for authors in this scenario." It's not just about writers - it's also about offering readers a fair deal. Thinking of it only in terms of the writers doesn't seem fair when the readers are also effected in actually getting access to the product.
For instance, I have a Kindle. Do I like everything about Amazon, no, not by a long shot. But I think that Apple will lock me into the same deal of "you can only use our products to read your books from now on" - and thus you're stuck accepting their prices, without competition, thanks to the hardware. Yes there are workarounds, and people can always root their devices - but reading a book shouldn't be this much tech effort in comparison to the simplicity of picking up a paper copy.
Again, I think it's a bigger issue than the scant paragraphs you wrote, and in the context of your article a bad fit/example of your main argument, that everyone's only after Apple for the cash.