I imagine an integration with Appetize[1] would be very useful, as well as an opening for a possible revenue stream. Being able to build an RN app and then run it right in the browser removes another barrier for sharing RN code easily.
That's how the original React Native Playground from the same people (Expo) worked. Google react native playground and go try it today. It's slow with appetize. But if they are still using it for sharing links to ur creation, they are still using it and have found the perfect use case: linked demos. But it would never be fast enough for updates as u type.
[1] https://appetize.io/