Familiar with the HomeKit thread. The excessive data use stopped after I turned HomeKit off on all my family account devices, left for a couple days until they fell off as options in HomeKit devices and bridges, and re-added them. This was shortly before 13.2.2 and seemed to work.
By work, I mean that Apple still attributes traffic to Uninstalled Apps, won’t come clean, and won’t tell what is adding traffic there. It’s not uninstalled apps obviously, I’ve done a tonne of troubleshooting.
Also strange that in restoring my config, the Apple rep who I had on phone at same time accused me of trying to pull something over on them. Yah right, makes sense, that’s why I had Apple pull the diagnostic logs remotely. Another thing that left a sour taste was their support folks inconsistency in acknowledging the problem, or reading back my case log to me so I could ensure it was accurate and not lost in translation.
Would rate the support I received from Apple as less than helpful. It’s too bad. Their last official answer to me was that they don’t know what caused it, they don’t have a fix, but they want me to redo all my troubleshooting steps in case something was missed because it was obvious I was lying to them.
Great way to lose your advocates.
So hopefully my solution may work for others.