"The Platform" in this context is a position that allows you to collect ~30% fee of revenue generated. Unreal Engine's position is much much smaller. Using my definitions Epic gamestore technically counts as a VR platform, but isn't positioned to become market leader.

> Virtual worlds don't need to be VR

Yes, but flat pancake games are even poorer at simulating a Disney theme park IRL than VR. It doesn’t even come close to a substitute, especially for the rides.