I found a server called Project Tempus and it is built to feel like a real civilization under pressure. The server is only online for four hours each day and it runs in set windows. That means everyone shows up at the same time and stuff like trading politics and fights happen in person.
Your base stays safe when the server is offline so you do not get wiped while you are asleep or at school.
The big twist is the time economy. You earn time just by staying alive in game and you can spend that time to craft stronger gear. You can also trade time to other players like paying someone with minutes.
There is also a class system so people have to work together. Farmers are the real crop makers because food grows way slower for everyone else. Smiths lower the time cost for crafting and repairs. Mercenaries get combat help because mobs are stronger. Miners get better yields for gathering resources.
It is hardcore too. If you die you get banned until the next window opens unless you pay a big time tax to come back right away.
