security risks not only on third-party app stores, but also on the App Store. Because of the large size of the iPhone user base and the sensitive data store...

https://www.apple.com/jp/privacy/docs/Building_a_Trusted_Ecosystem_for_Millions_of_Apps.pdf

Data is processed on the user’s device where possible, for example, in creating predictive traffic routing which displays estimated travel time on a device’...

https://www.apple.com/jp/privacy/docs/Location_Services_White_Paper_Nov_2019.pdf