Tailscale antifeature "This app tracks and reports your activity"

I am looking for an explanation as to what kinds of tracking Tailscale does. I can not seem to find any information as to what data is being collected. I do not mind a little data collection but I want to be certain that it isn’t sending back anything personally identifiable. For instance, crash reports can sometime contain very specific information that could easily be tied to a individual device and person.