Given that humans do without detailed data of this sort, I think it should be okay to leave manufacturers and service providers to figure out how proprietary or standardized the datasets should be.
I personally might never trust/desire an autonomous car, especially one connected to the internet, a phone network, or a car-to-car network. In a world where everyone has your best interests at heart, it seems like a nice feature; in the one world we've got, it doesn't.