Funnily enough the CIA (yes, the CIA) was largely involved in keeping the internet a free and open space for all, heck they even contributed encryption algorithms to keep data private and such ...

The reason why the free internet existed for so long was because it was a big ideological project for the US. (the internet is the space of all ideas and as such represents the platonic/christian concept of heaven). It's only now ending because it's served its purpose. The people have exchanged ideas worldwide, and that only needs to happen twice, similarly to how you can only infect yourself with the same virus once (because the second infection does way less impact), you can only infect yourself with the same idea once. So, once the worldwide ideas are exchanged, the internet serves very little purpose anymore.