First, let me make it clear that I am totally on your page regarding the distaste for nationalistic and protectonist policies and do think that in the long term

First, let me make it clear that I am totally on your page regarding the distaste for nationalistic and protectonist policies and do think that in the long term costs will almost always outweigh the benefits. Nevertheless, I want to point out that there seem to be two large real-world counter-examples to your argument: Russia and China. Both have made live difficult (or impossible) for US tech companies and both now have successful homegrown alternatives (Yandex and Baidu to Google, YK and Sina Weibo to Facebook/Twitter) -- even though I would argue both countries are not exactly known for their Silicon-Valley-style startup culture. The problem with many Internet businesses is that they are natural monopolies or "winner takes all" markets where it is very hard to compete against an entrenched incumbent. This is definitely true for social networking (because of the network effects that you need to be on the platform your friends are on) and I believe today also for Internet search (because of the enormous fixed cost of developing a competitive search algorithm and index and the very low marginal cost of each search query). And I think this is where Europe's different startup culture really comes to bite: I strongly believe that EU companies are from a technical point of view just as capable of innovating as US companies. But they are more careful, less financed and also have much smaller home markets, all of which contribute to the fact that they are much slower at getting products to market. And in a "winner takes all" market, being slower means getting nowhere. So, yes, I would say that the existence of these large US companies is one reason for a lack of large software companies in the EU. But (pre-Trump, at least) this is the beauty of international trade, no? You don't have to be good at everything. The US is good at producing world-class Internet companies (due to its startup culture focused on speed) while Europe is good at producing e.g. high-tech machinery (where probably being careful is more important than being fast). And there is nothing wrong with that - we use Google and Facebook and in turn the US buys our machines and in the end we are both better off than by having to duplicate each others' efforts ourselves (regardless of how good or bad we were at making clones).