Hello, for me this module helps the company in protecting the value of the information created inside the company, I think all the companies create sensitive information, some has to be compliance with some laws , other they simply have intellectual property that its has more value that all their assets.
Its difficult to put a value on the information, but the companies are aware that they need to protect that, the DLP module will help that companies at the begging to track all the operations with their information outside the company, probably they are going to understand that they to block or control some applications, then you have an opportunity of a CASB if they use the cloud with Saas Apps , or you need to encrypt that information to allow only certain users to see it, then you have an opportunity for Capsule Docs.
The information is quite importan today for all the companies, we need to show then that there is a module that helps then to protect that intangible asset. You can star working on a Information and data management with the customer, if he is already using a ISO will be easy to understand which data to protect, if the customer hasn't qualified its sensitive information you can use this references Body of Knowledge | Dama