Without Android and embedded, its market is mostly SteamaDeck and some universities for the most part.

Nintendo, PlayStation, Apple and Microsoft have their own APIs.

Visualisation industry is still largely on OpenGL, when not using middleware that uses each platform proprietary API, or moving into compute like CUDA as OTOY has done.

Khronos had to come up with ANARI, to convince them to even think about Vulkan in first place.