Why aren’t European people starting businesses in the US as pass through entities?

It doesn’t make sense to me why Europeans don’t use registered agents or foreign corporation state registrations to do business as US entities in order to get up and running quickly.

Europeans complain about the difficulty starting a business can just start a business as a US entity, you’re just using the US system as the financial layer.

At the point where you’re making enough money for edge cases or moving to a more favorable jurisdiction then you can afford to because you’re in business now