SANS ISC shares the need to better protect highly sensitive data in the cloud.  Some risk management techniques include: special encryption or avoidance (by simply not putting the most sensitive forms of data out there) 

Sensitive Data Shared with Cloud Services (sans.edu)

Back in 2020, the Nitro PDF service suffered from a data breach that impacted many companies around the world. This popular service allows you to create, edit and sign PDF documents. A few days ago, the database leak was released in the wild: 14GB compressed, 77 million credentials.   As you can see, many words look “juicy” and are directly related to business activities! By linking document titles with email addresses we learn about potential victims who could be interesting targets for social engineering or phishing attacks! Always be aware that cloud services store a lot of information that you don’t really want to see out of your perimeter!