As the USA and UK turn away highly skilled migrants, AU and CA are capitalising

One country's net immigration of talent is another country's brain drain.

How do developed nations expect developing nations to develop if the young trained people just leave after being trained?

Gold coin 'remittances' don't construct a nation, and they don't continue over time. If you've moved from Smallville to Metropolis, you'll know this. How much do you send back?

Taking talent from developing nations is just a continuation of imperial colonial appropriation in a new form. There are severe moral implications.