Offer a built-in hidden dash-mounted camera to record accidents.
Very few car makers offer a dashcam. The Corvette offers a 720p dashcam as a $1795 option on the base car.
Always-on dashcams are useful to identify vandalism while parked.
A good third-party HD dashcam (single direction) costs about $100-200 and a two-channel (front and back) dashcam for about $350, plus installation.
Update: The front AP1 autopilot camera is not usable as a dashcam. It is only connected to the autopilot hardware and does not connect to the main CPU. It is fairly low resolution, has a narrow field of view, is monochrome/red, and uses a non-standard 36 fps rate.
Update 2: The AP2 camera set is better situated to be used as a dashcam. All but the rear camera are medium resolution, but they do use a monochrome/red pixel arrangement for higher sensitivity. With enough processor power (an unknown) the images could be processed into a cyan/red sort of duotone image.
Most of the available flash memory is used for maps and caching, so with the current design, even if can record there may only be room for a limited amount of recording. Perhaps Tesla can record to a customer-supplied USB flash drive, although the bandwidth may not be high enough for a full 8 camera recording.
Implemented in V9 software in October 2018. It can record front, sides, and rear in full color while driving and parked (for HW2.5 cars only, made in August 2017 or later). Older HW2.0 cars can be retrofitted with AP 3.0 hardware and MCU2 and get the full dashcam features.
(voting combined from a close duplicate that has been removed)