> It's really not that hard to imagine, look at China or Russia or many other countries (e.g. Middle-East). Very aggresive white/blacklists of internet services.

Part of the problem is people thinking that such countries are creating the fragmentation whereas it were the US companies who literally partitioned internet through algorithms, walled gardens, filters and blacklists. A national firewall can be circumvented by VPN and many do. Its much harder to circumvent whatever limitations such corporations that control large parts of the internet create.