A lot of people in those cities don’t have cars, but a lot do. Especially in the San Francisco Bay Area, which has worse public transportation than NY.
Speaking as someone born and raised in SF, a shit load of apartment dwellers have cars. There are so many cars that you often can’t find a parking space near your building in the residential parts of town. Honestly, the main reason people get rid of their car is because the city has hit peak car capacity. You have to spend 30-60m looking for a spot in the vicinity of home.