I mean, I think the dances used to promote the song are just part of the film, like any other music video that isn't just the band playing the song (my mind imm

I mean, I think the dances used to promote the song are just part of the film, like any other music video that isn't just the band playing the song (my mind immediately fell to The White Stripes: Fell In Love With a Girl but there must be tonnes of examples). I think that a song by a vtuber is unlikely to top the charts right now because they're still not quite mainstream enough for that. I think the current perception of them is similar to how anime was perceived in the past ("Look at all those weebs simping over their fictional girlfriends"), but it is heading towards mainstream. HoloEN did a lot to popularise it in the western world, and I don't think it's unlikely that a song by a vtuber could gain more widespread popularity in the near future. They have the talent for it, it's just not quite escaped the "streamer" bubble