So the idea of permadeath is a very healthy addition to survival games like Unturned, it really makes you think through every decision you make. Only problem with permadeath is its usually introduced as a single player mode, but if you want to have it work for a server on unturned, youd have to have a to have a way to get back into the server, for example a temporary ban which will deny access to the server for 3-5 days`ish.
These kinds of servers also kind of put a barrier on the people you play against, making more likeminded people join the same kinds of servers. You can also say this kind of splits the community between people who likes commands and third person with the people who just like Pure vanillah hardcore survival.
A very normal approach to servers like this is also to turn of HUD, and chat. So for you to communicate with the rest of the server you may have to use radio stations. Laser sights also become a lot more useful because of the lack of aim assist when hip firing. Third person perspective isnt even an option for these kinds of servers, neither is kits/vaults/tp/home. But in some cases youl spawn in with some kind of lighting equipment like a torch or flashlight, because in harder survival games night= pitch black.
(The reason for the absurdly long ban time is because when you log back in, you have nothing. your base is despawned/raided and you will have to start ALL over again basicly like youve never been on the server before)