I found a server called MinecraftOffline and it is an anarchy lifesteal survival world. The big deal is the world is permanent and they say it never resets so anything you build or destroy stays.
It runs on version 1.21.11 and it uses custom plugins to make the gameplay feel different. It is hosted in Finland so it is made to feel good for players in Europe.
They also talk about their hardware a lot so it sounds like they want it to be stable even when things get wild.
