I found a server that is meant to be 18 plus only and it takes the adult only rule seriously. The owner said they finally had a kid sneak in and it caused a big mess so they are trying to stop it from happening again.
The server has players who keep to themselves sometimes and build a base and only talk when they feel like it. But the staff will step in if someone seems shady like asking about xray or anticheat or if stealing is allowed.
Now the rules got stricter and you have to use voice chat to stay. If you want an adults only place with active moderation and clear rules this server is aiming for that vibe.