You have just described the US top comparative advantage. There is no economy in the world that allows you to create a company, open a bank account and start trading. The UK come close but doesn't completely match the US.
The US is the global engine of the world because it has accepted to be very negative on NIIP. (https://en.wikipedia.org/wiki/Net_international_investment_p...) China or the BRICS or Russia do not offer an alternative and not because of lack of technical capabilities; they just don't want to do it.
China can replace the US dollar "hegemony" in a few years. They keyword is can because they don't want to do it.
It seems to me that NIIP is very related to high US stock prices. Everyone, including Americans, wants to invest in the US. Americans own American assets, and so do foreigners, but Americans don't want to buy foreign assets. Hence the high prices of American stocks, and the NIIP thing.
The US is the global engine of the world because it has accepted to be very negative on NIIP. (https://en.wikipedia.org/wiki/Net_international_investment_p...) China or the BRICS or Russia do not offer an alternative and not because of lack of technical capabilities; they just don't want to do it.
China can replace the US dollar "hegemony" in a few years. They keyword is can because they don't want to do it.