https://www.vice.com/en_us/article/qj8pbm/update-your-iphone-so-you-can-tell-apps-to-stop-tracking-you

Starting today, you will be able to tell apps to stop tracking you on your iPhone.

Apple started rolling out the latest version of iOS (14.5) on Monday, which could become a watershed moment in the history of privacy on the internet. The new version of iOS makes tracking an opt-in feature. In other words, when you install an app on your iPhone, you will have to allow it to track you across other apps, and if you want, you can stop it from tracking you entirely.