Glad I am not the only one who found that title and the subsequent readme completely unhelpful, despite standing up and maintaining a VPS server for my son and friends.
HN is great but sometimes has the ultimate “tell them about the features instead of the reason why you should care/benefits” posts and many people probably miss out on good links as a result.
The TLDR is a Minecraft server with ""no"" rules, where hacked clients, item dupes, and griefing are allowed. Only thing that's really banned afaik are lag generators and things of that nature that explicitly stress the server and ruin the QoL for everyone.
And thanks to that, people are extremely motivated to find various 0days in anything related to minecraft, to gain an advantage.
This server spawned some notorious black hats :)