I found a survival SMP that is basically no rules and it is meant for adults. It even says 18+ to set the vibe. Chat reports are turned off so people cannot snitch using that system.

It is not fully vanilla because it runs the Vanillabean datapack. That adds extra armor and weapons plus redstone and mobs and structures so the world feels way more interesting.

They also have anti xray on to keep mining more fair. Anti lavacasting is on so the world does not get ruined. Anti flight is on too. Lag machines get dealt with if they are made just to crash the server.

You can join on lots of Minecraft versions because it has cross version support. Chests can be locked with named keys. You can also pick locks using a lockpicking minigame. The grindstone is improved so you can extract enchantments or move them across material types.

There is a Nether exile thing where dying can leave you stuck in the nether until you get resurrected at your tombstone or you wait it out. The world was generated 25 2 2026. The border is 100000 by 100000 for now. The End is disabled for the moment.