I agree that US staff can probably move abroad (including to join foreign companies). My claim is that such a move can’t include IP, money, or sufficient numbers of chips. Given the importance of these three things, I still conclude that a move would probably destroy the lead of the AI company (or prevent the foreign company from catching up even with new staff).
I also think a clear mass exodus would be more politically actionable than the trickle of people to Mistral.
I’m not sure how “being in the sphere of another power” will affect things going forward. For example, if a company moves to Canada and produces near-human AGI, the power dynamics between Canada and the US might shift substantially to make Canada more independent.
I think this is a reason the US wouldn’t be comfortable with companies going to allied nations. It also might mean that many nations are reasonable options for AI companies as long as those companies can get financing. Saudi Arabia might be one example.