Edit edit: Looks like there really isn't anything to worry about. I suspect that your initial hunch is right that vocaloid is niche enough to not worry about it at all. I don't plan on limiting it in any way for the anime community.

~~I think you're probably right about vocaloid being niche enough to not worry about it. I was thinking more like 10 million views for my case. Looking over some of my favorite anisongs from last year, that would restrict about half of them. I'm not as plugged into the vocaloid scene, but that would eliminate stuff like Static and Birdbrain, while still allowing stuff like Flop Era or Magic Maid.~~

~~edit: I just asked for clarification in the lemmyvision thread.~~