I feel like the concern started getting popularised during the first Trump administration, because the US were overtly bullying the EU (and others of course). But the main change was that it was done overtly: before that the US has always been a big power trying to... say "defend the interests of the US" abroad. E.g. the US have been spying their allies forever. So I think it was more of a "they should stop bullying us in a few years", and indeed it went back to normal with Biden (again, "defending the interests of the US" and "leveraging their dominant position", which was kind of accepted).

The second Trump administration moved from "overtly bullying" to "behaving like a potential threat". In the second Trump administration, the US has used the tech monopolies against the EU and has become a military threat (not to mention the commercial war with tariffs). For many Europeans, it's not that the US are abusing their dominant position in negotiations anymore: it's that they are not an ally anymore. Not that they are seen as an enemy, but rather an unreliable partner who threatened to become an enemy.

I think that this is a very big shift, and that is why things are actually moving. And I don't think that this will change, because the risk of depending on the US monopolies has now materialised. That cannot be undone.