Saw a really strange thing today while Zwifting. There was rider from France, it caught my attention because she was marked red in the “Zwifters nearby” list.
Looked her up and saw the stats: +12 hrs on the bike, +360 Km with a constant 4.2 W/kg ~ 274 W. 
Even her profile pic was a screenshot of her being all transparent red.
What the hell did i see, some sort of Zwift-based benchmark test?! 
That’s a pace partner. There are 4 of them, each at a different power level. People follow them as a method of training.
Guess i found the answer
They usually are only in Watopia, I’ve never seen them in other worlds but have heard about it a few times. Not sure if that is intentional or a bug?
I think he meant that the flag associated with the rider indicated France. I think this is correct, as the red pace partner is Amelia Anquetil.