I think I've answered this one before, but I'll gladly answer again for the new folk!
At first it was kinda by accident. I was simply shown that a scale system existed for avatars in vrc(before the update), and kinda just wanted an output to experiment with it! Found out that I apparently struck a niche with using a femboy model, at the time, it was Sporti by Nibby, evolved into his own thing over time, and now he's really kinda become his own lil guy!
Since I started though, I've kinda had to evolve with the platforms I make my content in. Whether it be learning how to make my own scaling system(now depreciated), learning Udon, or blender, etc...
First photos, then videos, then animations... Kinda overwhelmed myself for a little, had to step back, and now I feel I'm in a pretty comfortable place with it...