Although smartphone users have the option to disable app activity tracking in the device’s system settings it was found that Google ignores these settings and continues to track the user’s app activity nonetheless.
source: https://www.reuters.com/article/idUSKCN24F2N4
archived source: https://wellthissucks.xyz/2020/07/14/google-continues-to-track-users-despite-opt-out-in-settings-archived-source/