We see a large number of $502M and the term "virtual." But what is Improbable and why would a city-state's sovereign wealth fund invest?

“We believe that the next major phase in computing will be the emergence of large-scale virtual worlds which enrich human experience and change how we understand the real world. At Improbable we have spent the last few years building the foundational infrastructure for this vision,” -  Improbable Founder, Narula