[Amezarak]

You don't need control over the DNS root zone to exert control over DNS. Other countries are well-known exert control over DNS.

The same goes for certificates.

There is no deep asymmetry, other countries already have the powers you are talking about and they are using them here, today, in the now.

You also did not address my point concerning their "legal power" over e.g. Microsoft/Windows and Apple/OS X.

As for cloud providers, they are located all over the globe, and countries they operate in have the same power you are counting the US as having.