Every single team I’ve worked in that needed a 3D creation tool has been on Maya. Certainly in the games industry it’s the 99.99% standard.

Never has been. It's slowly making inroads for things like previs on movies. But it's not a standard in vfx workflow etc. Despite being pretty usable. Standard issues apply. They already have a workflow and are loathe to change it if it works for them. Often open source is perceived not to have much support behind it like a commercial product would. (Why companies like Red hat exist) And most people aren't trained in it. Though that's a catch 22 that will likely work itself out over time.