To be fair it also heavily leverages those breakthroughs to maintain geopolitical power. Get on the US' badside (by, e.g., having resources you're not willing to allow to be exploited) and suddenly you're cut off from research, patents, data, etc. People often think of brain drain as being a natural consequence of the US providing more research funding but the US very actively seeks to undermine other nations' efforts to create similar talent-building projects. As a researcher, if you are at all associated with a domestic talent project you will be barred from access to research/funding. Often, your only option is to move to the US