The reason you can't understand it is that your entire premise is faulty. The EU already forced Google to unbundle parts of Android (while also issuing a 4 bill

The reason you can't understand it is that your entire premise is faulty. The EU already forced Google to unbundle parts of Android (while also issuing a 4 billion Euro fine) about 5 years ago. Specifically, for Android it's the device manufacturer who decides what gets pre-installed on the phone. The EU required Google to not make preinstalling Search and Chrome a precondition of getting to install the other apps.