Bad apple, but its a hacked battlebit server build. The Battlebit API is too limited to pull this off without the server crashing. So instead a small group of Battlebit modders use bepinex to mod the server build of Battlebit directly.
We've gotten direct permission from the dev team to do this. Despite that, its still a risk to mod Battlebit. Thats why I would not recommend anyone giving it a try.
Here is a link to the base I've used to create this (it allows for overriding voxels, destroying voxels is busted):
https://github.com/SwatDoge/SOTTBBVFM...