If an entrepreneur moves to Canada or Europe to start their brilliant company, what makes you think an American (or American immigrant) founded and funded deriv

If an entrepreneur moves to Canada or Europe to start their brilliant company, what makes you think an American (or American immigrant) founded and funded derivative company can't beat them in the market and create the jobs here anyway? If Uber was founded in Toronto or London or Shanghai, are you sure that Lyft wouldn't have crushed them?