Apple's essential point of differentiation with Android is the fact that they make money on hardware. Google give away their mobile OS to funnel more attention into their attention monetisation machine. Every step that Apple takes to protect user privacy deepens their moat, because Google only make money by harvesting data and monetising attention.

Google can't compete on privacy, so it's very much in Apple's interests to push that issue as hard as possible. Their decision to block ad trackers by default in Safari was very smart; deciding to insert ads into Siri or WatchOS would be indescribably stupid.