It wasn’t his idea, and thousands of people have worked on the technologies to enable it, and he’s not even the only billionaire with a company who is working on such a thing.
For the most part I see him complaining about people impeding him, rather than just solving the problems with his own resources.
"Timothy Dean Sweeney (born 1970)[4] is an American video game programmer, businessman and conservationist, known as the founder and CEO of Epic Games and as the creator of the Unreal Engine, a game development platform."
https://en.wikipedia.org/wiki/Tim_Sweeney_%28game_developer%...
"Tune in to hear Tim Sweeney (founder and CEO, Epic Games) during his SIGGRAPH 2019 Talk, “THRIVE: Foundational Principles & Technologies for the Metaverse.” You’ll hear Sweeney posit the state of the games industry, the rise of creator-centric and social gaming, what the “metaverse” really is, and what it will take to build the medium on a larger scale."
https://blog.siggraph.org/2019/10/siggraph-spotlight-episode...