The web was more open when to play those videos you had to use a proprietary Flash or Silverlight plugin?
That's what you are claiming with your sarcasm hidden behind a rhetorical question, I've never said anything about Flash or Silverlight in the comment you've answered to.
There is absolutely no difference from a conceptual perspective between EME implementation and proprietary plugins, EME is necessarily based on a proprietary spyware, but you can't fathom that fact apparently.
But as you just noted there is no conceptual difference between EME and the proprietary plugins that it replaced (Flash based and Silverlight based video players).
So how does replacing something with something else that is conceptually not different change that status of the web from open to not open?