macieksarnowicz is shadowbanned for whatever reason, but he answered:

Thank you for your feedback. We indeed offer a whole server (database cluster) and you can create multiple databases in it and have full control of the resources allocated to that cluster.

The admin user provisioned for the server is not a full superuser, but it is close to that. We are trying to find the right set of permissions to provide to our customers without jeopardizing our ability to manage this server for you. Please submit your feedback here: https://feedback.azure.com/forums/597976-azure-database-for-... if you see a problem with the permissions.