All that has to happen for a ‘Blackwall’ analagous scenario is enough undersea cables get cut/sabotaged.

Then you’re looking at a much more localized internet, where actually having a reliable or high bandwidth connection to a very far away place requires you to either have an insane jerry rigged solution, or a lot of money to pay for an increasing valuable, still existing intercontinental line.

Of course, we very much could also end up with a more intentionally constructed type of widespread firewalling as well… they already exist.

China’s great firewall, tons of other countries that have internet and/or social media killswitches…

… And we are already seeing massive bandwidth from corpo AI scrapers trying to harvest data to train their AIs leading to people making new ways to detect, block, and or trap them in infinite loops, to save their own servers from going down.