Great questions and comments - we are excited to continue to hear your feedback as you use and deploy our solution!
Addressing a few open questions from the comments: requirements to deploy and use Endpoint DLP, including AAD / hybrid support, build support (1809) etc - are available in our Getting started guide here: https://aka.ms/EndpointDLPGuide --> https://docs.microsoft.com/en-us/microsoft-365/compliance/endpoint-dlp-getting-started?view=o365-worldwide. If you have any open questions or see anything missing, please do let us know through the comments!
Classification in Microsoft Endpoint DLP is integrated with our Microsoft Information Protection classification engine that's used across workloads like Endpoint. This helps to ensure you can uniformly detect when data is sensitive, and re-use your customizations and fine-tuning across all the places you scan for sensitive data. Here's a link to our documentation where you can learn more, including how to create custom classifiers. https://docs.microsoft.com/en-us/microsoft-365/compliance/custom-sensitive-info-types?view=o365-worldwide
Thanks!