You can find some reports here by using Translation software(If this report hasn't been deleted yet)。
BiliBili once made a statement on Weibo， but delete in a few minutes.
https://www.heibai.org/post/1214.html
As far as I know, an employee who was illegally laid off by bilibili put part of the company's background code on GitHub to vent his anger.
And then GitHub has directionally shielded the keywords "bilibili" and "go-common",
But it can be bypassed by typing only one character less. there are still a lot of projects alive.
It is not yet known who leaked it.
Also for the reason.