So, just to understand what you say correctly, I will ask: Do you think it is ethically tenable to require these VR interested, enthusiastic people to sign up to FB (known to be privacy nightmare), so that they are able to use the product they spent lots of money on? Is it acceptable to force them to do this, just because they are sufficiently interested in VR? Is it in general OK to force people to connect with a third party, which has nothing to do with the actual product?

I am not sure whether you are trying to justify this move, or whether you are questioning that it will have an economic impact or really what the point is.