> Apple’s own apps don’t need to display the prompt because as per their privacy policy they don’t collect or use information for tracking purposes (which is also visible in the privacy labels of their apps in the App Store).
This is the privacy policy [0] of an example of their app, Apple News. I quote:
"Advertising
In order to deliver great content to you from leading publishers, Apple News is ad supported. If the Personalized Ads setting is on, Apple’s advertising platform may use information about your account, the topics and categories of stories you read, and publications you follow, subscribe to, or turn on notifications for to serve ads that are more relevant to you. We may also use information about your subscriptions to personalize your ads on the App Store."
[0] https://www.apple.com/legal/privacy/data/en/apple-news/