I created a 14-day trial account on Databricks.com and linked it to my AWS. I'm aware that DBUs are free for 14 days, but any AWS charges are my own. I created one workspace, and the CloudFormation was successful. I haven't used it for two days and then I noticed my AWS bill suddenly went to $1/day. I have no EC2s running. I have two S3s created by the CF, but they have <1MB of files stored.