I just imported the following ML notebook (getting started example): https://docs.databricks.com/aws/en/notebooks/source/mlflow/mlflow-classic-ml-e2e-mlflow-3.html into my Databricks Free Edition and it seems to work.
On the top right hand corner of the link I sent, there's an "Import Notebook" button. I copied that link, opened up a notebook in Databricks, clicked on "File", within the notebook, and then imported via the URL.
Serverless SQL Warehouse is the only one available, yes. Still seems compatible for some ML? (At least in this case). I do think there will be some restrictions for some ML functionality. Would be interested to see what they are. Please share what you're facing.
Let me know if it works for you!
All the best,
BS