Correct, but these autonomous vehicles can (should) also forward updates to the maps server. It's the same as with MAC address/WiFi positioning. When you enable

Correct, but these autonomous vehicles can (should) also forward updates to the maps server. It's the same as with MAC address/WiFi positioning. When you enable that positioning on your smartphone, it sends a list of MAC/WiFi entities with reception quality to the central server. The server looks up where you are based on that data, but at the same time updates its lists: some routers have disappeared (people moved) and some were added. Crowdsourcing at its best.