there's a difficulty in evaluating how much goes into Apple revenue because Apple mixes Europe (not just EU) and Middle East.
The 7% probably comes from a Daring Fireball article, based on misunderstanding some Apple communications, and which Gruber later had to backtrack
https://medium.com/luminasticity/when-smart-people-cant-reas...
Yes, I was coming from Gruber's article, thank you for correcting me!