Apple lies. You got no more privacy there than on any other phone:
https://www.politico.eu/article/apple-privacy-problem/
https://www.theatlantic.com/technology/archive/2019/01/apples-hypocritical-defense-data-privacy/581680/
https://appleinsider.com/articles/21/01/28/apple-illustrates-privacy-issues-on-data-privacy-day
https://www.applesutra.com/blog/apple-privacy-issues/
Two lib publications.
Facebook went ballistic when Apple allowed users to prevent tracking.
Seems it must be real protection