I don’t know, but how many routes are there to the Internet? It is surprisingly small. Control those and you control the Internet for your peope.
Most traffic is carried over a small number of cables. See submarinecablemap.com for those underwater.
Add land cables to that. And then satellite access.
That’s it (I think).
If I had to put money on it, I would bet you can’t control ALL the access, but you can control all the access for 99% of the people.
The same is true in the US. The vast majority are restricted to whatever the big cable and cell phone companies allow.
I think that they are not restricting, but they could.