They would love to, but they know that wouldn't work. Those companies (and many others in many different countries) control some of the possible mediums on top

They would love to, but they know that wouldn't work. Those companies (and many others in many different countries) control some of the possible mediums on top of which the Internet can sit. The Internet is a concept, not a bunch of cables and hardware, and that's what makes it so resilient. People would find a way.