Saw someone I knew ran a marathon, so I went to search them on Strava. They have their map on and so I can see where they've started and ended their runs, unless they've hidden part of their route. That is super dangerous information to have on there.
There was famously an issue where deployed military personnel were accidentally telling the entire world exactly where they were because theyβd go for a run around the base and Strava recorded itβ¦
Strava prompts you to make exclusion zones. It basically masks a radius around these points and won't show anything inside them. Eg, I have a 700m zone around my house. I don't bother masking work (where most of my runs start/stop) because that's in the city and could be half a dozen buildings.
People have to choose not to make exclusion zones.