So the funny thing is... the lead researcher added "finding diamonds" since it's a niche and highly difficult task that involves multi-step processing (have to cut wood, make pickaxe, mine iron, ...) that the AI was not trained on. DeepMind has a good track record with real life usage of their AI... so I think their ultimate goal is to make the AI go from "Minecraft kiddies" to something that can think on the spot to help with treating rare disease or something like that
Y'know they could have used something like Slay the Spire or Balatro... but I digress
Welcome to the Google DeepMind Minecraft SMP server : ) (/s)