You don't seem to understand the technology or the argument you made. The URL bar says google.com because google.com is serving the content you are reading. In other words, it exactly honors the "fundamental contract" you find so important.

I also dispute your qualitative opinion that nbcnews.com works "just fine". If I load their top story currently from AMP it loads in about half a second. If I visit it from nbcnews.com it renders in about seven seconds and doesn't finish loading for about 90 seconds, and then when it does I get a big popover survey/ad thing with a dismiss button that's too small to touch. The mobile experience on this site is far from fine.