Why would apple leave the EU? It's a huge market, and I don't think there is a risk of their profit in the EU going negative because of some relatively small concessions. They can keep existing rules for the rest of the world and change them slightly for the EU. Unless they are afraid that other countries will demand the same if they budge?
That's amazingly low given that Europe has such a large portion of the world's wealthy consumers. Even then, I think it'd be a huge risk to Apple if they created the perfect conditions for the might of the Polish/German/Ukrainian/Dutch developers to create their own Apple competitor.
look at the “by country” table. If sorted by mean, 2 countries in the top 10. If sorted by median, 3.
I agree that 7% of app store revenue seems low. HOWEVER keep in mind that the EU is tiny on a population level. Not a single county cracks the top ten. So maybe not so surprising…