Not to go off topic too much, but it should be noted that in South Africa there is also an extremely authoritarian form of affirmative action or black economic empowerment, etc. which effectively means you _have_ to employ people based on their skin colour when your business reaches a certain size or effectively you can't do business in the economy. It's a form of justified-racism directed at a minority group (< 10% of the population is white) that stifles the labour market and makes things like SpaceX impossible.
The "brain-drain" you speak of is skilled white workers who are leaving the country because they can't get work or can't advance in their careers, etc. A completely stupid problem created by the government's own ineptitude.