If privacy really is a concern, I don’t understand why pilots are up in arms about this system.
Already, by default, when you use Garmin Pilot - even just to upload database updates on the ground - the entire logging data is downloaded to your iOS device and then sync’ed with fly.garmin.com. That has been happening for years - and it includes position data and time stamps.
This new Cirrus IQ system just uses a cellular interface to upload that data to another cloud.
Any law enforcement agency could already tap the Garmin cloud for almost all Cirrus Perspective/+ pilots and get the same info.
Why the fuss now?