This is a good point. I don't see Apple having an interest in just simply electric cars, but that's just my personal opinion. Electric cars aren't a new working concept. Autonomous cars effectively are. Why Apple would take this long to enter the electric market is beyond me. But they may be thinking of things here that you or I haven't yet. So there's that.
Electric cars aren't a new concept, but doing it well is. IMO, Tesla is the only serious electric car company at this point and maybe Apple wants to get involved too when more competition enters the scene (sounds like VW, BMW, and maybe Mercedes might get in the game soon). How many big traditional car makers are there? I don't see why it shouldn't be the same with this new wave of electronic vehicles... and it won't necessarily be the big traditional makers.