Throttle steering a bicycle
 

Looks kinda cool but feel like asking, why?

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A bit like parkour. Interesting but what's the point?

I will fall off on my fat ass so fast on that thing. I love to see them do this at speed going down a canyon. Fun to watch.

I remember riding my Sekine 10spd home that way after a crash back in the 70's: Broke the frame weld just below the handlebar. That was NOT a fun ride home.
This articulated frame makes cornering better?? I think dragging the rear brake would have a similar effect. Show me again, call me unconvinced.

Too cool

I had a trek like that in the 90's. Turns out it wasnt a documented feature, early bonded frame didnt like my riding style I guess.

Very, very weird. It would be interesting to try riding one of those, but I suspect it would take a bit to get used to. Looks very weird.