But that is true for the US as well, the US also serve customers all over the world with their datacenters. Most South American internet companies for example host their infrastructure in the US, and it would not be surprising if South American full Bitcoin node operators would also set up them mostly in the US.
Anyway the topic of this thread, I think at least , is the cryptodollar. We could describe it as the importance for countries to count with a good number of Bitcoin owners and producers - in this case the US, where it could strengthen their own currency because people have to buy US dollars to buy Bitcoins from Americans. The mechanism is a bit different from the petro-dollar, but its effect should be similar if the assumption of the OP was true.
It is quite difficult to find data about the Bitcoin ownership distribution per country. Of course there are websites like Bitcoin Treasuries, dominated by American companies, but the amounts owned by the companies and states listed there are relatively small, about 12% of the total if we include financial companies and entities like MtGox. So from more than 80% of all Bitcoins the location is unknown.
I think the US ETFs for sure strengthened the US position in Bitcoin holdings. But their customers may not be all Americans, not even the majority. Anyway, it matters for the "cryptodollar" assumption because non-American US ETF customers have to pay USD at least to an intermediary to buy the Bitcoin ETFs. Thus their contribution to the "cryptodollar strenght" is positive as long as their inflow is positive, but if they begin to sell, they will be net negative for the "cryptodollar".