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labras

I was referring to user data, not program data/log (despite it can as well containing some user data in some way).

Syslogd can be compared to windows event logs.

Zeitgeist stores your information on it's datahub, where 3rd party applications can retrieve it from. Nothing prevents such applications from sending this information elsewhere, once accessed.

As this comes out-of-the-box by default, and is in fact a pain to switch off, I compare it to this new windows behavior.

Agree! Ubuntu and similar, along with zeitgeist pre-installed, do exactly the same.
Not completely true. Don't forget you need an account, for instance, to buy, install and use MS Office 360. I bet if it wasn't for the Office, many people would move away from Windows easily.

And don't forget windows comes with Defender installed, which collects user metrics out-of-the-box. IE/Sparta also collects your usage data. Even windows "search" does.