That's fair but the only complicit European country in the Five Eyes is the UK (and, well, not for long anymore I suppose). I don't think I'm willing to jump to

That's fair but the only complicit European country in the Five Eyes is the UK (and, well, not for long anymore I suppose). I don't think I'm willing to jump to the conclusion that "if the UK does it then certainly the other european countries must do the same". The UK<->USA relationship is rather unique. At this point you need to look on a country-by-country basis, I doubt there's a secret EU-level agreement to let the USA spy on EU citizens. For instance I could believe that the Germans might consider it, if only because they have a bit of a blind spot when it comes to international intelligence and diplomacy. That being said industrial espionage would be an obvious drawback. On the other hand I really don't expect French intelligence to accept such a scheme. French has its own network for international intelligence and is perfectly capable of spying on its own citizens if it wants to. There's simply too much to lose letting the USA in unchecked. As for the rest of Europe it's also hard to make a simple guess. Some countries like Poland are historically very USA-friendly and might accept something like that. Others on the other hand align much more with Russia nowadays and might be more willing to collaborate with the FSB than the CIA. So I still don't buy the "european countries let the USA spy on their citizens". It's too much of a leap considered the evidence we have.