For the most part, they are allowed to try that, right? And, most large economies are able to transact in whatever currency they want.

It does seem different, since America has no mechanism for setting other nations' tax and regulatory policies.

That said, I think fairness is pretty dumb in situations like this. The relevant criteria is what's best for people. Just because other countries are doing dumb stuff to their economies, doesn't mean we should follow suit.