The [ONT → OLT(+BNG)] → Internet] sections of the paths will continue to be owned by commercial entities that can still be the subject of court orders and/or government pressure.
Even if you were to roll your own cable in the ground to your own ONT/OLT/BNG at some point you will need to acquire IP transit or peering from other commercial entities.
The latter usually isn't that difficult, just expensive. You can usually rent a leased line from anywhere to anywhere. The government will still come knocking if they think you're evading their censorship.