Really interesting tech. Since ProjektMelody is a thing (and afaik rather successful as more than a novelty), I wouldn't be surprised if there will be more 'virtual cam rooms' utilizing the motion tracking technology as it becomes more accessible and developed. The benefits are pretty clear I'd say...
1. Significantly more anonymity. There's no risk of accidentally showing one's face, a tattoo getting recognized, someone in the hometown recognizing your room, etc.. There's less of the personal feelings to settle through since, heck, one can be fully clothed and such. The only thing to recognize the person would be the voice, and that's hard to pinpoint someone on. Plus, I imagine it would also make it harder for the stalker/crazy types to track the model down.
2. If one doesn't feel confident in their body for whatever reason, they can basically adjust it to their choosing. There are some unique things that are impossible to replicate in reality. 'Changing bodies' for someone's fantasy character in private, adjusting one's proportions to match the ideal, jiggle physics (lol), and so on...
3. People pay top dollar for this stuff. Never underestimate the weebs of the world. There is a reason Hololive is a thing, and there is a reason ProjektMelody is successful. I can all but assume there is an untapped market of people who mainly get off using 2D/3D Hentai that aren't really interested in realistic model cams. As the tracking / animation gets better and better, this is going to attract more and more of the market.
Somewhere down the road, I really wouldn't be surprised if there becomes a competitor to the big cam sites that is catered towards exclusively virtual cam models.