Whey then doesn't any country, say China or India, declare such a blockchain to be an essential 'public good' and clone Bitcoin or Ethereum, whatever is utilitarian for their purposes? At least they'll save on the Ether prices for their DApps!
What purposes exactly though? It's hard to really speculate if we don't even know that much. To raise money? To raise influence?
Also, for what it's worth, clones generally don't do well in the market. Look at how many forks of Bitcoin are in the wild. It can probably be argued that a country would have far more resources than run of the mill crypto teams, but even then, I only see clones being popular in their home country, if at all.