I don't think that's necessarily related to the prevalence of unions though and where it might be related it is far from the only factor as there are many other

I don't think that's necessarily related to the prevalence of unions though and where it might be related it is far from the only factor as there are many other at play there from unrelated legislations and governance styles all the way to reserve currencies. Even just the fact that Europe was/is a fractured market preventing the rice of something akin to silicon valley.