I had a ride of mine flagged.
I was riding along the road but GPS inconsistencies put me on a nearby bridleway where I must have smashed the genuine KoM (and I wasn't even trying). I'm assuming this has happened numerous times to many different rides as I wasn't aware of the inconsistency at the time.
When, some months later, the ride got flagged the Strava bods were fantastic and just removed my time on that segment letting me keep the rest of the ride.
In summary, while I'm sure people do go out to cheat the system I'd just like to point out that some times innocent mistakes can happen.
P.S. Just remembered I'm in a top ten position over a local bridge too with, I think, a time of four seconds. The bridge is approx 75 metres long with a right angle turn both on and off. The KoM is two seconds! There's no way anyone in the top ten is genuine imo. Still waiting to be flagged on that one.