[SoftwareMaven]

There is no "responsibility that comes with leadership." There is fiduciary responsibility, which they are doing a good job with (which may include "jerking other companies around"), regardless of market position. There is responsibility to your customers, because no company can survive without that (which also may include "jerking other companies around"). But if there isn't clear monopolistic behavior, there is no responsibility to other companies.

Apple may have 90%[1] of the mindshare in the market, but they can't use that position to keep somebody else from entering the market and they can't use their position to control another market.

I want to be able to read books using the Kindle app. I will be pissed if I can't. It will make me seriously consider whether to get an iPad or an Android tablet when they get good enough (since that will be my primary reading platform at that point). But Apple has every right to do that. They aren't keeping Amazon from entering the electronic book market in any way, and I can find dozens of devices roughly equivalent to my iPhone that I can read those Amazon books on.

Kicking ass does not a monopoly make.

[1] Yes, I made this number up, but I think it is a reasonable approximation of something you could never quantify, anyway.