To my limited knowledge, they don't. Deep nets are mostly used by the self-driving companies for processing camera data for image detection and segmentation tas

To my limited knowledge, they don't. Deep nets are mostly used by the self-driving companies for processing camera data for image detection and segmentation tasks like detecting other vehicles, recognizing street signs, etc. Presumably, having 3D point clouds lets you hand-code solutions to a lot of these tasks without having to use ML.