What is the origin of this "Bad Apple" video, and why is it everywhere all of a sudden?
It's not really all that recent, if you put it into YouTube you'll find ports of it to all sorts of retro consoles and PC's all throughout the last century. I assume it's also quite popular for this use case since it's monochrome.
As more examples, here are more recent videos also inspired by the Touhou series: https://m.youtube.com/watch?v=xRSlq42_sUE&vl=en
Wikipedia article: https://en.m.wikipedia.org/wiki/Bad_Apple!!
I recommend watching this video, "Bad Apple explained:History and Analysis": https://m.youtube.com/watch?v=6QY4ekac1_Q It's fascinating.
I think this video is a fabulous example of community creation.
No one involved complained as long as end result remain roughly BY-NC and the music is cool so everyone just took it and put into various projects, which only made it increasingly famous.
The original song was for the PC-98 game by ZUN, vocal remix was by Alstromeria Records, I don’t think video creators for the concept and the famous version has preferred names to be associated with.