VR is still a niche, but I wonder if the transition from tethered VR to cheap and easy to setup mobile VR (not cardboard) will finally make VR mainstream.

There is a big difference: tethered VR is powered by a PC with expensive GPU, while mobile VR uses phone hardware. Likewise you cannot expect mobile VR to run games like Subnautica unless the visuals are trimmed down.

Is $CYBR optimized for mobile VR?