The privacy rating is for that app only. You should also see a list of the various trackers that the app has built in. But you won’t know for sure what kind of metrics the app is sending, for example, location, usage patterns, etc. So pay attention to the permissions it wants and disallow them in the phone’s permission settings.
One application’s data tracking won’t bleed into other apps or the OS, however it will potentially run in the background even when you’re not actively using the app. One thing you can do if you decide to install the app is to also install a tracker-blocking app like Blokada 5
, TrackerControl
, Netguard
, etc. When you see the Paypal app is making connections you don’t like, block them in the tracker-blocking app (if it hasn’t already blocked them automatically) and see if the app still works fine without the tracker(s). That should at least give you more control when using privacy-abusing applications.
From Exodus Privacy website/app checker: εxodus