Do they? It is my understanding that the (originally London based) Eurodollar market deals in USD without US treasury oversight.
As will Hong Kong soon.
Infact one of the most interesting/scary incidents for the US dollar was China selling USD denominated bonds and getting almost the same rate as the US government gets, which essentially means China can compete for USD with US government.
The implications of this is that if CHina wants, they now have another level to compete with the US. They can now issue USD denominated debt along the yield curve in areas where it would hurt the US hte most.
In the short term that is the frond end of the yield curve(short term under a year) where the US has to roll about $8 Trillion in debt over the next year.
With China competing by offering bonds here they will force up the interest rate the US has to pay pushing yields up with is the exact opposite of what Trump has publicly stated that he wants and making the US's already large fiscal deficit an even larger problem.
Nah, they have a lot of them, they don't want their value to drop.
What the world wants is to escape (at least in the medium term) is the US oversight that forces the USA's enemies to be everyone else's enemies.
From what I can tell, they are going to use (are using) Hong Kong as a ex-USA location to price and trade USD - modeled on the Eurodollar. With a lot of trade-with-China being settled in their e-CNY CBDC.
As a poster alluded to - the big loss for the USA is the insights into pricing and demand.
Nascent, but that's the trend AFAICT.
You can open up an USD account in maybe Zambia and transfer funds to another USD account in Dubai without it ever touching the US financial system.
The law seems to get used whenever the US wants to jail someone it doesn't like (but doesn't have a good reason)