I wonder how much of this is network effects? I cannot describe how many times I have fired up Minecraft all over again after not touching it for awhile because oh, a friend made a server and my other friends are playing too! At least in my experience, it seems to just be a thing that if a social circle contains mostly people who happen to enjoy video games, even if we formed around liking to sing or something and not our love of video games, it will try to make a Minecraft server.