No idea, but they certainly should have. I’m no boffin I’m afraid, but I imagine your grandchildren would need a vr180 camera and could stream or upload the feed to a secure connection to you. You would just need the headset and good internet.
My vision was for like a 3D webcam. So the grandchildren or whoever could go about their daily business playing with lego or doing what they do, and a remote bored grandparent could just pick up a headset and log in and watch the fun from the comfort and peace of their own home. Even if they were in a different country they could almost be in the same room as their family.
I think there would be big demand for that type of set up if possible.