Some can even expand to give you a full dungeon experience in co-op. Lots of potential to build on. My first experience with the genre was Fallout 76 and for all its faults the survival hooks kept it alive to this day (I long retired it). It was entertaining for a bit. At that point you had to give yourself your own reasons to play; which early on was just building your house. Conan and Ark are other big games in the genre and I hear offer deeper multiplayer and dugeon experiences.
I can see why players love them. So it doesn’t surprise to hear a new one is taking off and in particular on pc.
Personally I’m just waiting for a different game to bring these gameplay hooks together in a better package suiting my tastes. It’ll happen at some point…
Fallout was a good setting for that. But that game would need a major rework and a full fledged campaign/expansion to even look at again and not really what they’ve been doing.