

Fingerprinting refers to a technology which can identify you via multiple attributes without explicitly logging in. Like if you use a niche browser with dark mode on, preferred language lithuanian, keyboard layout russian and screen resolution full hd. Combined those and many attributes like installed plugins can be used to identify, and its called fingerprinting.
Plesse don’t give them any ideas. Here’s a list of what’s currently included
https://systemd.io/USER_RECORD/