1) It's subsidised through cheap labor. The start-up whose founder live and work in buildings built by undocumented labor. Eat food grown by that labor, and served from food trucks run by undocumented labor. It's innovation subsidised by misery.

2) the brain-drain is unethical because it takes subsidised education of individuals without returning anything in return. Emmigrants should get a bill of the cost of their upbringing. It's really free-loading, especially for a country with such a poor public education system as the US.