Linux distros log a TON about what you’re doing by default.
Tonnes of software uses systemd-journald to log errors, the bash shell saves everything you type into the terminal, and wtmp, btmp, utmp all track exactly who is logged in and when, and the kernel uses dmesg to log a bunch of stuff.
While the system isn’t sending these logs to Microsoft or Google, anyone who gets into your system like police or hackers can see almost everything that you have been doing.
If you want to be private, you must disable them.
Just switch to physical pen and paper…
Wait, CRAP, did you know that a pysical notepad logs every pen stroke? not only on the paper it’s written, but it puts traces onto the next page as well.
Sure it’s not sending it to others… but if the police cease the notepad they can recover everything currently written in it, and possibly even some of the pages that were torn out from the indentations on the other pages.