EEE is about making standards and protocols incompatible with competitors. This literally cannot apply to Skype as it was never compatible with anything. I don't know what part of that is so hard to grasp. You seem intent on using your own definition of "every bad decision Microsoft ever made" or some such.
I never indicated that the definition couldn't include open implementations, just that the definition wasn't limited to ONLY openness. There are plenty of examples of this behavior not even exclusive to Microsoft. Proprietary products can build on an open protocol and attempt to change it, sometimes for the worse.
I didn't bring Skype into this, so I'm not going to comment on it as an example.
