What is actually of value here? There's no actual game, it's incredibly expensive to compute, the behavior is erratic.. It's cool because it's new - but that will quickly wear off, and once that's gone, what's left? There's insane amounts of money being spent on this, and for what?
Dreaming and sleeping is incredibly expensive, we spend 33% of our "availability" on average asleep.
This kind of work is a step toward building similar tools for general AI agents (IMHO).