Apple is ahead of the curve[1]. You get a system-level popup asking you for consent to be tracked. Actual, not implied consent - only "yes" means "yes".
So you say "no" and it means "no". Apps are blocked from all basic forms of tracking (like device ID), and the App Store rules state that apps that try to circumvent that will be kicked out. Apple doesn't fuck around - they've kicked Meta and Epic without blinking an eye.
EU's response? Kick Apple, because EU companies can no longer do targeted advertising on Apple's platform. Our regulators are full of shit.
[1]: Well Apple still tracks you in their first-party apps, but that's a different story.