Off the top of my head there are ads for third-party apps in the Apple Health app, ads for subscriptions and whatever in the Music app, ads for the Apple credit

Off the top of my head there are ads for third-party apps in the Apple Health app, ads for subscriptions and whatever in the Music app, ads for the Apple credit card in the Wallet app, ads for completely irrelevant crap via "curated" lists in the Maps app (no way the SF Chronicle is getting free placement in Apple Maps).