AI masters Minecraft: DeepMind program finds diamonds without being taught

Making the AI do, at great expense, what your five year old cousin can also do. If you just dig enough, you will get diamonds eventually.

I am also willing to bet that 'not being shown how to play' has a very particular definition with huge loopholes.

An issue solvable with Brute force anyway

I'd genuinely not be surprised if the AI grifters find some way of making AIs play games for profit. I'm already aware that Xbox now has some sort of AI assistant for it's system, but I'm imagining a cluster of AIs playing TF2 against each other for no discernable reason. Kind of like how Facebook is just a bunch of bots talking to each other for ad revenue