Apple & Google aren't managing IDPF, they're collaborating with them as members. Here's the list of IDPF members w/ Adobe, B&N, Apple, Google and a whole slew of others:
link
You might be right that B&N may have its own DRM but they at least collaborated with Adobe in its development:
link
Jeff Bezos, Amazon CEO, told USA Today the reason Kindle doesn't support epub: "We are innovating so rapidly that having our own standard allows us to incorporate new things at a very rapid rate."
link. You might be right about the format, but they're using their own standards that probably go way beyond the original Mobi that, if you're right about them buying it, makes it proprietary--the opposite of open.
I agree that users should be able to strip DRM legally, though I doubt that'll happen (but really, is anyone watching for ebook pirates?)
