That misses the largest and fastest-growing market for VR: self-contained systems like Oculus Quest, which has had no real competition for about a year now.

They ask that you pitch them with marketing materials and get permission before you start working on anything, so they can "compassionately" tell you not to even start:

* https://developer.oculus.com/blog/submitting-your-app-to-the...

* https://developer.oculus.com/quest-pitch-form/

> If we feel that your app is not a fit for Quest, we'd like to let you know that early in the development process, before you've made significant production investments, rather than at the end.

Steam also has an approval process that is becoming more and more controlled.