Carmax and Carvana also provide a service. They bring a bunch of cars to one place that you can peruse and buy. That's a better experience than trying to connect with a bunch of randos on craigslist.

Zillow hasn't gotten to the point where they provide that, but theoretically they could. You could drive around with a Zillow agent and see their 50 homes for sale a lot quicker than coordinating with 50 random sellers.