In the future, your company will subscribe to one or more cloud products — if it hasn’t already. Shadow clouds would, in fact, be a more significant threat to your company’s confidential information than IM or social networking blogs. With a shadow cloud, you’re at greater risk because your confidential data is more likely to be hosted on the cloud provider’s systems. Early on, most IT administrators went around uninstalling IM where they found it and wagging a finger at “early adopters””]
Source: https://www.csoonline.com/article/2627273/security-forecast–high-chance-of–shadow–clouds.html