Mocking Google for their totally-not-an-attempt-to-DRM-the-Web is the right thing to do.
Open issues on the proposal repo and let them know what you think.
Politely.
But, don't be fooled. Even if they take this back, it doesn't change how they think. This is their intention. They just failed to slip it by this time.
The answer is to take power away from Google. Stop using their stuff. Build alternatives. It's not easy, but it's the only way.
And mock them. That's always fun.