KubeRoot

But the removed count only includes a one year period and caps out at 250, how would you find the new average?

Regarding osu’s source code, I think the original osu (osu!stable) is closed-source, and I think the servers might be closed-source, but I believe osu!lazer, the new reimplementation in C#, is fully opensource. It’s an ongoing effort and a long-term migration it’s in the middle of, but lazer looks great and I think it’s already meant to be the main version now.