Earlier quoted context omitted.
What happens to people's emails in Gmail if they exit business in Europe? Surely people won't just be cool with their leaders making them lose access to their emails? EDIT: I guess I didn't mean "what if Google was forced to do this overnight?", but rather I meant more like "couldn't Google make this backfire by doing this overnight?".
That's one part of the negotiation puzzle. EU would want it's citizens to retain access to their google-hosted emails. Legally speaking, I'm sure there's plenty of ways the EU can force Google to do things it currently does not want to do. I'd say the EU has lots of negotional angles currently to win things from Google. That is kind of what you get when you have more or less universal legislation power over 40% or so…
Europe GDP is 20.9 Trillion USD. The world GDP is 107 Trillion USD. So Europe is only 20% of the world GDP.
But one can make the argument that EU citizens are better connected and spend more on digital goods. Though I'd be surprised if it drives more than 30% of Google revenue.