I found Imperium SMP and it is a semi anarchy teams server that is built around competition and constant player interaction.
The main goal is to climb the rankings with your team and try to be the best. PvP matters a lot because when you kill someone you take 5 percent of their money so hunting people is part of the grind.
Trading is a big deal here since there is no auction house so you have to talk to players and make deals face to face.
The world border is 10000 by 10000 so it can feel tight and dangerous. You can get griefed or jumped way easier which makes teams and rivalries happen fast.
The server is currently in development so it sounds like they are still building it up.
