"We may collect your device's advertising identifiers (Google Advertising ID or Apple IDFA) for analytics purposes and to ensure accurate attribution through mobile measurement partners (MMPs) when you install apps or games promoted through our Service. We use information about the time spent by Users in other apps and games to offer rewards to them for the time they spend playing certain games."
The service monitors your activity in other apps and games on your device using advertising IDs and multiple attribution/analytics partners (Adjust, AppsFlyer, Kochava, Singular), building a cross-app profile of your behavior.