People who want to play video games, or watch videos using hardware decoding, or train machine learning models? DRM here means https://en.wikipedia.org/wiki/Direct_Rendering_Manager

> DRM exposes an API that user-space programs can use to send commands and data to the GPU and perform operations such as configuring the mode setting of the display.

> User-space programs can use the DRM API to command the GPU to do hardware-accelerated 3D rendering and video decoding, as well as GPGPU computing.