Agree with this. I've had 2 Zwift segments marked this way in the last few days. 

Innsbruck KOM virtual segment too hazardous for Strava 😱

Could it be that they are essentially duplicates of other segments?  Strava doesn't really give a good way to remove a segment other than to flag it as hazardous.  I could see someone getting fed up with a bunch of duplicate segments and just deciding to try to get rid of some of them by flagging them since they don't have a good alternative method.  Hiding them would probably be the better option, but many may not know or understand that feature.

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