Of course, most of the revenue today is generated from selling cars. But we were talking about the value of the company. And this includes expected _future_ returns. And, obviously, Tesla has more than just aspirations. They have built a large part of the Gigafactory already.
Honda certainly is not a car company - but much more than this as well. This was not a good example for your case. Same with GM. I am not sure if your intention was to list companies that are much more than car companies? You were just making my case.