I would agree with that, that ultimately nothing can exist without purpose, creative intelligence, because that is the only phenomena that can truly create anything, rather than be constrained by an infinite regression of cause and effect
exactly, we know the video game is designed creatively, intelligently, and it includes countless vast worlds, never to be explored and with relatively minuscule areas of actual practical use, just like the universe.. When vastness is merely a result of the math, it's not a problem at all.
neither the creator of Minecraft nor the universe (be it God or naturalistic event) was restrained by how many trips they could make to home depot to gather materials for the job! Awe inspiring size is no more 'expensive' to create than a tiny universe, so why not go big, even if for nothing more than inspiring awe in your creation?
Were we blind creatures feeling our way under the ice who could only ever remotely theorize about the wonders of the larger universe, this 'superfluous universe' idea might make sense
But in this case we are even given an almost perfectly transparent atmosphere to marvel at the heavens, front row seats to the grandest galaxy in the cluster, a perfectly sized mask for the sun, (the moon) allowing us to study the corona, the structure of stars, and hence the makeup of the larger universe. Even vast supplies of accumulated energy in convenient fuel, allowing us to reach the moon, planets and beyond.
Of course it's not technically impossible that all this is one extraordinary coincidence, just as it's not impossible that Minecraft was written by generating totally random code
I just think there are far less improbable explanations for both