I would enourage the backers of Verge3D to consider making it “open source” – or, to offer a source-code license – because in the long run I think it will be better for your business.
I respect that this is intended to be a sustaining, for-profit business venture. I respect the fundamental need for revenue in any such venture. I’m a software businessman myself. I think that it is perfectly reasonable to charge money, e.g. by subscription, and I think that your customers will actually be quite willing to do this, even if they can get the source-code on Github. Notice for example what the Blender Foundation is now doing …
I do not subscribe to the popular acronym, "Free and Open Source." You can collect sustaining revenue from a product that is open source or for which a source-code license is available. You don’t have to use any of the GPL licenses. “You own it. You can legally do anything you want.” People aren’t going to steal your pants.
I’m trying to make the business case to you and to your financial backers that it would be an impediment to your business aspirations for the source-code of this system to remain closed. And so, “enough said.” No reply is needed – just think about it.