"Steam revenue" describes at least five different measurements, depending on which analytics firm and which scope is being cited. This suite maps the commission structures, revenue concentration, discoverability mechanics, and first-time-user-experience design that separate mobile free-to-play from premium PC and console distribution; what each means for where a studio should launch.
Platform revenue growth and developer outcomes have decoupled far enough that the topline is not merely unhelpful as a greenlight input. It is actively misleading.