> A gaming engine just really doesn't seem to fit that mold
Even more to your point, Improbable doesn't make a full game engine...they make SpatialOS.
"SpatialOS is a cloud platform that provides hosting, online services, tools and a multiserver networking stack for developing and operating your multiplayer game, using any engine."
Also several projects using SpatialOS have folded recently
https://www.eurogamer.net/articles/2019-08-12-another-spatia...