That being said, people will always want to travel in style, whether they own the car or not. Think black car versus beaten up taxi. Apple wants to be the luxury brand intersected with technology. Who else does that as well as they do?
Also, as per below, Apple's model of making things which can't be serviced by the owner fits the idea of no ownership.
Finally, this new business model is going to obliterate all the old car makers that can't evolve fast enough. When significant disruption vectors clearly exist that can only be leveraged by the extremely well capitalized... well, this is really a no brainer for Apple.
The only really question is, can Tim Cook create the tech? Google is struggling with it and they are by far the most skillful at AI.
In the end though, we'll all be better off with Apple in the race than out of it.