User Privacy and Data Use
Starting from version iOS 14.5 and above, there is a need to receive the user’s permission through the AppTrackingTransparency framework in order to track a user or access his device’s advertising identifier.
See more information here
What's the impact?
CHEQ uses a first-party cookie, so there is no impact.
The iOS change addresses the mobile device’s advertising identifier, and the permission to access is between apps.