monica_b1998'StravaLeaks': France's aircraft carrier located in real time by Le Monde through fitness app
I only share my strava activities with followers, unless I’m doing an event or I’m not starting from home/work/standard locations. And I have no real reason except for simple privacy (and a minor fear for stalkers and bikethiefs)
So you share your activities with the company Strava and all its employees and your followers and anyone who has managed to hack Strava either through technical means or social engineering and any law enforcement that demands access from Strava.
This may not be a problem for you, but for anyone in a military it could be.
What I mean is that this particular military guy did not even take that simple precaution.