[rank0]

If you can't route traffic outside of the country, it doesn't matter if you can resolve domains. You still won't be able to reach your destination IP.

DNS lookups still rely on your ability to route traffic outside your country anyways.

Neither of the above points even matter if your government can control the ISPs operating in its border. Government says to ISPs: "cease operation or well put you all in prison"

[bluGill]

You replace the root DNS servers with your own. It isn't that hard, if you are reading this you should be able to figure out how to do it in less than a day.

Google.com returns an ip of your favored in country search engine - most likely people get a https error when trying to go there, but those that ignore the error find search works for allowed things and the rest learn to use the favored search engine.

You - as a national actor - can easily cut your country off from the internet while still getting many of the benefits of the internet.