I found a self hosted Vanilla SMP that is all about normal survival on Java 1.21.10.
It has a world map you can use and besides that it stays completely vanilla.
They are trying to keep it as a small community and they also want operators to help it grow. It runs on an old desktop that has been up for a long time so it is meant to stay online.
Gavins Vanilla SMP Small Community
GG.MINEWIND.NET New Server IPTrue Vanilla Survival No Claims
I found a server that is trying to be true vanilla survival. It keeps the gameplay simple with no plugins that change how Minecraft works. There are no land claims and nobody is going to hold your hand.
The world is run by the players. You can build whatever you want and make alliances or start wars. You can also just explore and live out in the wild if that is your thing.
There is basically one big rule which is no hacking.GG.MINEWIND.NET New Server IP