One of the interesting things about real colonialism is that the Europeans had wildly better legal infrastructure, that supported wildly better economic infrastructure, which supported wildly better military technology, which supported colonies. The proof in the pudding is that Europe's legal structure is unsupportive and hinders software development on the scale of an Apple or a Microsoft. Until they fix that, they…
Compare getting someone to move from Chicago to San Francisco (same language, same culture) versus getting someone to move from Norway to Italy (completely different language, very different culture).
So USA had a much larger effective work force when a company wanted to hire developers and much easier marketing of the products.
Europe had a lot of computer hardware companies in the 1980's but they were never able to capture the full European market. So they died out due to lack of scale.
There is also the problem of every single country wanting to be a king, so there was no political will to say "we need to join forces and create one single SV" (or one single unix company).
Still today EU can't create an European Silicon Valley as you don't get a SV by saying "we want a SV here", you get it by saying "everywhere else is NOT going to be a SV".