Ability to block
Ability to stop DNS request to certain countries I know there's top level domains but it does not do the same thing if you were able to just to say no more of this country I have a lot of quarries that are unneeded going to random places it'd be nice to have more control for privacy and security
I’d be more concerned about figuring out what’s causing queries to those random places than trying to blocking them. Also for the NextDNS service to determine the location of an IP address, prior to sending the response, would seem impractical if not impossible. It would definitely slow down a response, even if it could be done.