What’s the proof of that? There are enough probe points for them to gather data. For example, iCloud push notifications must give them some data on your activity in apps that they don’t control. They’ll have some idea of the apps you use and how frequently which is enough behavioral data to do targeted advertising if they wanted to in the future.
Now you may say that some data collection is unavoidable given the nature of the device (eg push messaging) but that’s often also true of other company’s products.
