"You are the Apple of my eye"... Apple to its own apps. Apple's App Store is a massive marketplace for the world's scrolly-tappy desires. But in addition to owning that marketplace, Apple also competes in it with its own apps: Apple Maps, Books, Podcasts, etc.
Silicon Valley dominates Europe's scrolly-tappy ways... The EU hates that Apple, Facebook, Google, and Amazon are making bank off hundreds of millions of European users — without really paying any European taxes. And it hates the home-court advantage:
This is a wider "platform-player" issue... The EU is investigating other American tech giants too, saying they're abusing home court advantage on their own platforms. BTW — the US government is also running its own antitrust investigations. Platforms like the App Store have created an explosion of opportunity and wealth, but they seem to be playing favorites.