Because the military-industrial complex of the world’s largest super power invested in the basic research and infrastructure to create this context. It’s the same reason the Soviet’s excelled in technological pursuits relative to many small European countries and why Russia still has an outsized place in IT.

Because Finland, while would appreciate having such large companies, doesn't want this kind of shitty social environment and inequality, so it doesn't encourage it. Besides, it does just as well (and ever better than the US for the large majority of its citizens) without having billionaires...