That's quite incredible. The power of having a such a large social media following I guess.
It's just something cute to celebrate tech.
I don't know what's the name of that style, but it's used a lot in the vtuber community. So much so that searching "vtuber logo" on Google Images will return mostly images that look very similar to those from the repo.
https://twitter.com/sawaratsuki1004/status/17821291471434139...