It goes in direct conflict with your idea. I am sure you know some people within your circle that say they cannot leak data but the fact remains. Over 85% of Fortune 500 companies use some combo of OneDrive or Sharepoint. The companies have already gotten familiar with the risks and legally are comfortable with the MSAs. So I am not sure what legs you are standing on.

Absolutely there are specific companies or industries where they think the risk is too great but for many, outsourcing the process is either the same or less risk then doing it all inhouse.