Also, not everyone has the resources to move to another country.

You don't need much. Just a job willing to sponsor you, or be willing to start a business on an entrepreneurship visa.

And enough money to relocate across an ocean, if you can find a job willing to sponsor you, which is not at all assured. And starting a business requires initial capital.

If a job is willing to sponsor you, they are usually willing to pay the relocation expenses up front. Just like in the US if they want you to relocate across the country.

People have migrated throughout thousands of years on much less than most people have today.