The extreme upper range of YouTube channels sometimes use a RED camera. I've not seen a lot of ARRI for YouTuber behind-the-scenes. Usually they go with high-end prosumer full-frame mirrorless Sony, Canon or equivalent. Those are probably below what the Cyanview's stuff is intended for or just on the edge of what gets used.

I suppose FX30, FX3 and FX6 is in Sony's cinema line and may have all the color stuff that these systems want to tweak but I'm not sure. These cameras do get a fair bit of play on YouTube.