Who says they need to go that far? One can build alternate DNS systems without self-isolating, in fact they should. Air-gapping like you suggest is extra work and not necessary to implement new domain registration control and DNS root servers. Also it kind of defeats the point because it isn’t a stand against IANA it’s saying build your own internet, not take back the one we already have.
Those countries are free to build out their own tcp/ip networks and configure them however they like. North Korea did it, how hard can it be?
Who says they need to go that far? One can build alternate DNS systems without self-isolating, in fact they should. Air-gapping like you suggest is extra work and not necessary to implement new domain registration control and DNS root servers. Also it kind of defeats the point because it isn’t a stand against IANA it’s saying build your own internet, not take back the one we already have.