Sounds like the worst idea ever to me. It will stiffle inovation and adoption of technologies developed by those with not-the-biggest-site-in-the-world.
Functioning again as a barier against net neutrality, it goes against everything that made the Internet open and great.
Much easier to throttle traffic from a website when it's actually from a website. If many websites reference the same external resources, it's harder to throttle websites individually.
Functioning again as a barier against net neutrality, it goes against everything that made the Internet open and great.