I want to propose a strictly simpler theory: there isn't any organized Oligarchy assaulting the Internet. There's just lots and lots of people with various interests trying to exploit the Internet for their own gains. Tons of companies, big and small, that don't think twice about fucking up the Internet in pursuit of profit. Politicians who want more power. Law enforcement people that want to make their jobs easier. None of them wanting to destroy the Internet, because the very thought doesn't cross their minds. They don't think in that large of a scale.

I.e. the usual tragedy of the commons. Things were all fun when they were irrelevant. Then the Internet started to matter, and the exploiters came, fucking everything up.