The distinction is not quite between driverless vehicles and current vehicles. It's more between cars that are connected to the Internet, whether they're driverless, semi-autonomous, or partially autonomous, and old model cars that are not connected to the Internet. The privacy risks arise out of the fact that currently, and certainly in the future, cars are connected to the Internet in part for transportation safety reasons, which are, of course, very legitimate and need to happen, but also for other reasons. For instance, when somebody drives their vehicle in 2018—and maybe it will be different in 2030—and behaves a certain way and goes to certain places, data is collected and potentially shared on driver behaviour and the location of an individual. Clearly personal information is collected by these cars, which are connected to the Internet, that could be shared for any number of purposes, such as for marketing, insurance, and so on.
On May 9th, 2018. See this statement in context.