You control how Apple delivers advertising.
Ads delivered by Apple may appear in the App Store, Apple News, and Stocks. These ads don’t access data from any other apps. In the App Store and Apple News, your search and download history may be used to serve you relevant search ads. In Apple News and Stocks, ads are served based partly on what you read or follow. This includes publishers you’ve enabled notifications for and the type of publishing subscription you have. The articles you read are not used to serve targeted ads to you outside these apps, and information collected about what you read is linked to a random identifier rather than your Apple ID.
Go to Settings > Privacy > Apple Advertising > About Advertising & Privacy.