As an advocate (and practitioner) of European digital sovereignty, let me tell you, at least from my perspective, it has absolutely nothing to do with fear of US intelligence agencies spying on us, and everything to do with the catastrophic consequences of an unreliable and unstable American government pulling the plug on our vital infrastructure, or at least the very least weaponizing our dependency on American companies.
I live in Denmark, a country whose primary threat at the moment is the USA, and the thought of Donald Trump effectively having a kill-switch to our highly digitalized society is absolutely frightening. Reducing our dependence on American tech means that we are less vulnerable to a hostile power using it to extort us out of our territory. We cannot remove the threat entirely, but we can make the pain less extreme.
Other EU countries are also seeing things this way, that the US no longer has a stable government and is no longer a friendly country. Who cares about American spying when the real threat is your country being turned off?
As a Canadian who has been listening to the "51st state" wordvomit coming out of US administration your comment is very apt.
For some reason I can't fully grasp, a LOT of US citizens are ignorant to how the rest of the world is perceiving them at the current moment. There's countless US articles talking about US/Canada relations as if it is a trade dispute and that they think Canadians are eager to re-unite and go back to the way things were without ever addressing the threats to our sovereignty. Then you have comments like the parent to your post who is....wildly off the mark thinking that in a point of contention we'd prefer to keep our data on US controlled systems because their government would need to follow their own legal processes to acquire data of a foreign/hostile state??????