Interesting... though unsure about potential pitfalls or costs in the future. I tend to be extra leery if I don't see clear pricing, including anything related to distribution costs/fees from something that isn't open source.
Not against commercial efforts at all, and this definitely seems cool, just need more on licensing costs and plans for monetization before I would look deeper.
We are going to support early adopters and ensure it's fair from a monetization perspective. We would be looking to pass through costs related to server fees above a threshold and in line with other SaaS platforms. That said, we are very interested in speaking with people creating cool things and can subsidize the server costs if it contributes to the adoption of the 3D web and supports our business goals as well.