My bike crash just outside work last year (thrown over the front after hitting a pothole at 20mph) was tracked on Strava, including the trip to hospital in an ambulance. This at least helped me piece together some of what happened and work out how long I was unconscious for.
I can see stuff like this (and gopro footage) being subpoenaed by accident investigators in future, although it's also useful for more vulnerable users proving others at fault, or for snitching on red-light jumping motorists.