A few years ago I came across a Minecraft server called "BitQuest"(http://bitquest.co/) and it caught my attention immediately!
It was a year or 2 after I had gotten into Bitcoin, and I ended up Buying Minecraft just to play on that server.
After playing on the server some and learning more about it, I found out it was open source!
I talked with the developer 1 on 1 and gave him some ideas, but essentially he said: "It's open source, do what you want"
Now me, I learned lots of computer stuff from 2005-2009(11 computer classes exactly) but most of which was java.
So, I was very eager to jump in!
I forked the original BitQuest code and started AltQuest(Still in progress after years)
After realizing how much it is for just 1 person to do as a hobby I put it aside for now :/
Since then, I have had LOTS code merged with BitQuest and feel VERY happy about that.
I also started my own Minecraft server EmeraldQuest(http://emeraldquest.co/ & https://github.com/AltQuest/EmeraldQuest-HackerIsland) but it currently doesnt involve any crypto, I mostly started this server to test my own stability running & upgrading it and actually test Minecraft plugin developments that I could later use on AltQuest.
I get my EmeraldQuest stats from here: https://minecraft-mp.com/server-s189942
And EmeraldQuest had been running for over 1 year all self hosted out of pocket on my own machine.
I am upgrading the machine its hosted on soon, but I am also looking for further funding/donations to work on AltQuest.
AltQuest will be a MultiCrypto Economy Minecraft server, to start with I will plan to have BTC, LTC, DOGE, and keep Emeralds for people that dont want to use crypto.