With a more stable currency, this means more investor confidence, and more confidence for other countries to trade using that currency. There are a lot to be said on this topic, but overall, countries use another's currency to facilitate trade look at 2 main factors: how big your economy is (to cushion the global trade) and how stable your currency is. This was why the pound was THE major global currency about 100 years ago, until it lost its empire, which massively reduced the size of its economy, and hence the mantle was passed onto the US dollar. In recent years, the US dollar seem to be starting to lose its shine given the country is losing its stability and some US politician's allure to the MMT
https://en.wikipedia.org/wiki/Modern_Monetary_TheoryAs for the amount limit that's transferrable, this is only there to individuals to prevent capital flight (limited to $50,000 per annum), it's not limited to companies.
I remember the last time I tried to buy a flight ticket with Qatar Airways, one of the currencies they accepted was the yuan (kinda upset they didn't accept the sterling). This probably will challenge the US Dollar's role as the dominant currency, which is actually terrible for the US in its long term debt structuring.