Technology

I'm not talking about physical infrastructure, and the handful of European companies/brands you mentioned are small fish compared with the US giants. Yes a lot of Europeans work in tech, but the vast majority of them rely on US products to do so, and a good chunk of them work in European subsidiaries of US companies.

The point i'm making is that Europeans for the most part rely on digital monopolies controlled by the US which are subject to the whims of the US government and which co-operate with and are also to varying degrees infiltrated by the US intelligence agencies and the national security state. This gives the US government a lot of control over an important sector of your economy, not to mention a direct pipeline to the minds of your citizens.

A sovereign state would see this digital colonization by another country's monopolies as a serious national security threat. China for example made sure that Chinese citizens predominantly use Chinese social media platforms instead of allowing them to become dependent on the US's. But as another commenter pointed out, Europe is not sovereign, it is a collection of US vassals.