There's a train of thought that says the reason we don't see aliens from other worlds is that they have all gone towards artificial inner worlds rather than ou

There's a train of thought that says the reason we don't see aliens from other worlds is that they have all gone towards artificial inner worlds rather than outer space. They in essence have fallen into a game never to come out rather than explore space. Seems that that explanation might have some merit given this article. We might be heading in that direction.