Interoperability is the ease with which one can move or reuse components of an application or service. This is maximized when services are designed without specific dependencies on underlying platforms, operating systems, locations, or cloud providers.

Conflict of interest is a threat, not a control.

Explanation
ISO 31000:2009 specifically focuses on design implementation and management. HIPAA refers to health care regulations, NIST 800-92 is about log management, and ISO 27017 is about cloud specific security controls.

The data owner is usually considered the cloud customer in a cloud configuration; the data in question is the customer's information, being processed in the cloud. The cloud provider is only leasing services and hardware to the customer. The cloud access security broker (CASB) only handles access control on behalf of the cloud customer, and is not in direct contact with the production data.