Usage patterns can be unique enough to track the same user across different services, some of which may have the user’s PII and thus a link to the user’s identity.
Could be a good idea to send events in batches, so the app collects event counters locally and only sends it in bulk every few days (exact interval being random). That way there’s no specific date/time associated to events, just that “for the past 3 days the app has been opened X times”.
