I recall when Windows 10 came out some company had demanded to know all of the things it sent back to Microsoft over the wire. Microsoft had some guy basically run wireshark and a bunch of network scans while using it and put that in a report. It blew my mind because it implied nobody at Microsoft actually knew what it was collecting and when anymore than your average security researcher, possibly because there are so many sub-entities in the company hoovering it up for different purposes.