To me the chart shows that VR is mainly used for games. And the steam chart don't include the games played directly on the Quest headsets.

That's certainly one useful spin, but the red flag here is that these don't correlate well with games known as best VR games to VR communities. What I believe to be a more accurate interpretation is, there's nothing but VRChat in VR, and gaming demand in VR can be ~10x smaller per title relative to it.