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I'll chime in here (Disclaimer, also dev for the Azure Notebooks team, etc etc)

If you want to alter/play around with the demo, you can "clone" the sample library, which will prompt you to create an account if you have not. This process is free/noncommittal/just requires an email address, but lets us create an env + storage for you to run and persist it in. Post-cloning, you can run any library you own like you would expect.