Also, it should be noted that, since it just proxies a single user notebook server, JupyterHub doesn’t support any interaction, sharing, or other collaboration between users (though one could implement some of that by mounting an NFS share inside notebook containers). Still, I’ve found it quite useful for teaching. IIRC, there’s also a project underway to bring collaboration features to Jupyterhub.

To JupyterLab, yes it's working but google retired the real-time API, so the project have seen some delay as we are reimplementing the Backend server where we were hoping to use Google Drive. CoCalc (ex sagemath cloud) already have real-time notebooks.