They kept the Americans out with homegrown competitors which are openly government-affiliated spyware, and even so it was routine for technically savvy people to use American social media through VPN until they cracked down. I’m not sure this points towards a workable strategy that’s compatible with the EU’s goals and principles.
I am pretty sure Europeans are not ready for the compromises that come with this approach.
It’s also easy to misunderstand the sentiments, from the comments here. We Europeans do not hate the US or American companies in general (though some are evil, of course, just like some European ones). OTOH we are seeing the privacy nightmare they are building for themselves and really don’t want that, thank you very much.
“Buy European” is limited to nationalist loonies and privacy-conscious nerds, mostly, and in the latter case it’s not because of anti-Americanism. Fix US laws and 1) Americans will live better lives and 2) these sort of issues will disappear.