Earlier quoted context omitted.
As a European I have to ask the very same questions about US apps and European interests. Even though I personally do not harbour strong suspicions towards the US, it's not a given that the US will always act favourably towards the EU, Europe as a whole, or any one particular EU country in the future. Especially in light of recent elections.
Europe should ban American social media companies. They'd be doing themselves a favor, and a favor to most Americans as well (who, shareholders excepted, do not personally benifit from these tech corps being so massive.)
Any democratic country that has a large portion of their population using american social media is essentially a modern US colony.