Yes you are correct, youtube has the VR button available on any video in fact, it will split the video in two for a cellphone head set, aka cardboard.
Cardboard SDK was made open-source a year ago, it was just updated a few days ago and I was able to build for it in unity, but the tracking quality seems less than for a reason unknown to me, and it’s fairly quiet looking around online, but technically is still alive and updated.
I might be wrong but I believe the chain of events was cardboard/Google VR. Samsung gear cellphone head sets, Google daydream cell phone head sets.
Samsung and Google both discontinue the head sets as a failure, SDKs stopped. Cell phone VR is considered subpar.
Deticated head sets are now the focus, cell VR has little market.
Cardboard SDK is made open source and is still updated for now, but lack of user base and seemingly lack of quality compared to YouTube video VR on the same device…that one could be a setting I’m unaware of but I did see complaints of that elsewhere.
I was gonna continue to play with it, anything you make can easily be brought to a headset but after some frustration and and end result that’s tracking slightly poor in comparison to other cell VR apps, I guess I’m done unless I see an exact fix for quality.