I is too easy to attribute this to some „culture“ that randomly formed and which did not happen in europe. I mean how likely is that? I believe there is a much more structural thing to it
Because when WWII ended and Europe was rebuilding, in some low-key corner of the West Coast of the US, some military contractors were trying to figure out what would their next projects look like (and getting more money from the US Gov. to fight the Russians, of course)
Then these guys became the best (read, selling more) in one thing called semiconductors then the best at this other new thing that was called computers and that's how it went.
And I might add that being the junction of tech and (accidentally) some weird hippie corner of the US might have helped in some aspects.
But one of the biggest issues in Europe is that it's not very unified yet. A French startup will launch a French product, not a "European" product. The only way to get buy-in from enough people is to have a multinational startup and product. An initiative promoted by both Germany and France has a better chance since it may appeal to ~150 million citizens.
Yet the overall scene is not quite as dynamic as the one on the other side of the Atlantic. Startups never seem to be as well funded or advertised. People take fewer risks here, there's no obvious culture of risking it all to found a startup. The whole ecosystem is not designed around this. Maybe this is changing now but today the market really isn't flooded with local products but rather with products of Silicon Valley. A lot of investments in European startups still come from SV instead of being local. There are some products that are big in one European country but don't really seem to make it over the border and it's probably because Europe is not as unified a marked as it could be.