[rimantas]

Does it by any chance depend on checking "Send usage and diagnostics data to Apple" checkbox? Is that identifier used for anything else, i.e. can it be associated with something identifying the user, not just saying that all these requests came from the same machine?

[blinkingled]

If you read the link it says upfront that this happens after disabling all privacy related options including usage and diagnostics data.

Besides why does Apple need to know the user clicked About This Mac? A crash log I can understand but this is unprecedented level of tracking on a desktop OS.