Hence why I said that the more data an app is trying to get access to, the more random variability should be introduced. Some apps might legitimately need acces

Hence why I said that the more data an app is trying to get access to, the more random variability should be introduced. Some apps might legitimately need access to some data points with "minimal" random noise. But if they start asking for enough to uniquely identify a user then the OS should just "blur" all the data. Battery level can randomly vary on any app that can't justify knowing the exact value. Imagine the app having a "budget" for getting exact data: it can spend it on 2 precise data points or 10 very blurry ones. Unless Apple decides to implement some form of VPN to obscure the IP there's not much to do about that, the phone can hide it only from the app, not the server. On a mobile network this seems less of a concern, and even in the home it wouldn't allow unique identification. So assuming the IP was the only thing that leaks and every other data point is "poisoned" by the OS, I'm sure it would make those companies tracking you deeply unhappy and unsatisfied. Maybe some loopholes can't be closed, others may provide precise data but it's shared with millions of users making it as generic as it gets. Just raising the bar for successfully tracking the user to a very hard to reach level, and lowering the overall accuracy to the point it's no longer a practical concern could be good enough for all intents and purposes.