I found 1fighter2defenders and it is a survival server that tries to stay as vanilla as possible.
There are no gameplay rules at all. No land claims and no protection so you can get griefed or you can grief back. Building cheating and everything else goes.
They also say there are no server sided dupes and there are no world resets. The server started in April 2021 so it has been around for over 4.5 years with lots of players showing up at least once.
It runs on 1.21 and you can join on versions 1.17 through 1.21.11.
No Rules Vanilla Survival Chaos
GG.MINEWIND.NET New Server IPCracked No Cheats Anarchy SMP
I found a cracked anarchy SMP where you can do basically anything and the world is meant to be chaotic.
They still have some rules though like no cheats or exploits. They also do not allow rape jokes or extreme racism.
The server hosts weekly events. It supports Java and Bedrock on version 1.21.11 and it says support goes until 26.0.GG.MINEWIND.NET New Server IPDuck’s Anarchy 1.12 No Rules Chaos
I found Duck’s Anarchy and it is a 1.12 anarchy server with only one mode. It feels like the kind of place where you log in and anything can happen.
There are no rules and no limits. People can grief raid and fight all the time. Traps and betrayals are just normal here and big builds can get smashed whenever.
Staff do not step in during wars or fights. There are no resets so the world keeps going forward. If you keep a base alive it is because you played smart or you were ruthless.GG.MINEWIND.NET New Server IP