I found a server called MinecraftOffline that runs on 1.21.11 and it is all about lifesteal anarchy
The world is permanent and they say there are no resets so whatever happens will stay in the history of the map
It also uses custom written plugins so the gameplay has unique twists and it is hosted in Finland which should feel nice for European players who want low latency
They also list reasonable hardware and a 1 Gbit network so it sounds like they care about keeping the server running smooth
