@backsla.sh_: Your phone has sensors that track physical stats like orientation and movement. These sensors have manufacturing imperfections unique to every unit. On Android, websites can read them without ever requesting permission. However, you can disable this in developer options. VPNs don't help and it can be tough to defeat this entirely. It survives private browsing, cookie clears, and factory resets. Look into a privacy focused browser on desktop, but be warned that this is very difficult to prevent. For educational purposes only.