I'm 43, I don't play regularly because of work/kids/etc. but every now and then I log into one of my favourite servers and spend some time there.
Two years ago I have built a base on 2b2t[1], located millions of blocks away from spawn, it took many hours of travelling through nether highways to get there. Before starting the journey, I had to escape spawn (a very dangerous area since 2b2t is an anarchy server) and I had to find valuable items from scavenging abandoned bases. After I finished my base, I made friends on the server, I have also helped building one of the highways, using a hacked Minecraft client that includes tools to build tunnels automatically[2].
There is also another server that I have visited regularly, MinecraftOnline[3], I built a house there and I made some friends, this one has rules and moderators unlike 2b2t which is an anarchy server. On both servers there is a rich community, a subculture specific to the server, and even specific activities that stem from each server's subculture[4][5]
Based on my experience, I have to agree with the article, Minecraft is an amazing and diverse metaverse.
[1] https://en.wikipedia.org/wiki/2b2t
[2] Highway Tools demonstration https://www.youtube.com/watch?v=rwkDk_Xn2Y4
[3] https://minecraftonline.com/
[4] https://minecraftonline.com/wiki/Pigchinko_(Game)
[5] Guide to Crystal PvP on 2b2t https://www.youtube.com/watch?v=YOImrm9ldTY