Because the EU isn't really a market (at least for consumer goods), it's dozens of markets. Despite no tariffs and (very) roughly aligned regulations, you've st

Because the EU isn't really a market (at least for consumer goods), it's dozens of markets. Despite no tariffs and (very) roughly aligned regulations, you've still got dozens of languages, norms, expectations, and income levels. Something developed and tested in Massachusetts will sell better in Wyoming than something developed and tested in Bulgaria will in Sweden. Funnily enough, despite being part of the EU for decades and still having a comprehensive trade agreement with them, the UK's success in tech is probably more to do with being culturally closer to North America.