What is the meaning of the existence of this virtual world?

Buddhist practitioners can make use of this world to cultivate; sentient beings undergo retribution in this world—apart from that, there is nothing else of any significance.

What we face is clearly nothing but electrical signals—there is nothing there at all—yet we interpret them into a six-sense-object world of dazzling colors and splendid variety. Those electrical signals are not real existents either; they are conjured forth from seeds that cannot be seen or touched. In truth, there is nothing at all in the world, and there is no world either. Sentient beings have an affliction of the eyes, like a film over them, and yet they insist on seeing the world and all the dharmas within it.

As for the world and all the dharmas within it, if you consider them meaningful, they are meaningful; if you consider them meaningless, they are meaningless. Dharmas have no mind, objects have no mind, scenes have no mind, the world has no mind—it is sentient beings who have a mind: whatever meaning they confer upon a scene, that is the meaning the scene has; whatever meaning they confer upon the world, that is what the world means. If you have no mind, there is no world; if you have a mind, there are all dharmas.