Sounds interesting!
Our use case is simple, but the motivation is to get rid of Auth0.com for different reasons both in short and long-term, and use directly FB and Google social logins in our Expo.io app.
In short-term, we simply have a showstopper with Auth0. After “engaging” with Auth0 customer service now for a week, have to start look for other options…
In long-run, I’d rather manage one user DB, instead of having two in both Auth0 user list and in Graphcool User type. Also Auth0 user management tools look nice, but don’t really match our long-term needs.