Maybe it runs on Linux because jupyterhub does not work on Windows, not even on Linux subsystem? Microsoft ported docker to Windows, please do the same with jupyterhub!
RE Jupyterhub on Windows - if enough customers want it, I'm sure it can be done. Not convinced the demand is there yet. If you have data I'd love to see it!
Thanks.
https://github.com/jupyterhub/jupyterhub/issues/703
Also original issue here and "Wontfix" comment: