The assertion that other countries should simply abandon their sovereign regulators' powers is baseless hubris. The fact that the US seems happy to allow corporate titans to reach ever new sizes does not mean anyone else is on board.
If the US wants their regulators' decisions to carry weight in another country, they can pay for the privilege via trade agreements, same as it ever was.
If the US wants their regulators' decisions to carry weight in another country, they can pay for the privilege via trade agreements, same as it ever was.