Taking a single false positive in your spam folder as a sign that Google has joined a campaign against the EU sounds insane.

They literally control Google Search, Youtube, the entire Android ecosystem, have a small army of lobbyists and hundreds of billions of dollars to influence politicians, and instead of the literal millions of more effective attack vectors they have, putting .eu domains in their spam filters somehow made it onto their priority list? Really?

Especially when the alternative explanation is simply, that Google's spam filter had a false positive, like all spam filters have.