I think money is one.
But let’s turn it around; what’s the benefit of owning one? I guess it kind of depends on where you live and what other modes of transportation are available to you. But in my case, I live in The Netherlands, in a city. I can walk most distances, or use my bike when needed. For longer distances I use public transport.
For a while I did own a car though. My job was in a location not easily accessible using public transport. In that case it absolutely made sense for me to get a car. Saved me a ton of time, which was worth the money to me.