I found Slappster SMP Reimagined and it is a Vanilla plus survival multiplayer server where players run the world. It feels like one big strategy game where power and politics matter a lot.
People can create nations and build up real civilizations from nothing. You can team up with others or make rivals and try to control land.
Wars are a huge part of it. You can conquer territory defend allies and fight for dominance.
There is also an economy vibe where players trade and use taxes to grow stronger. The server supports Java and Bedrock crossplay so more people can play together.

