Tell that to China, Iran, Turkey (?), etc.
And yet this was/is one of the justifications for implementing this.
They're not doing it in the EU because (a) there are decent privacy laws, and (b) IP addresses are (IIRC) considered personal information and so Cloudflare DoH would be responsible for keep a whole bunch of data safe. They may not want that responsibility.
This seems to (currently) be US-only because of the sucky US privacy laws.
Most democratic or even hybrid regimes are not prepared for that level of absolute chaos and consequent protest if half the Internet is shut down. You can only pull that shit in a dictatorship.