I used to think to the contrary, but have changed my mind. I now think all Strava segments on MUP's that are not clearly uphill at maybe 3% grade or more should be flagged. If the KOM is close to 20mph or faster, flagged. If the KOM is like 15mph uphill. Sure, you're good.
This 2 mile or 1/2 mile flat segments with corners at 25mph on an MUP is pure nonsense.
If you remove the carrot, some of the crazy MUP racer folks won't have incentive to try to be a fake hero any longer.
You could still go out there for a safer and protected workout. Shoot, even take the tri/TT bike out there for a workout. But.....without a segment to chase I betcha they'd dial back the crazy a good amount around blind corners and people.