Apple buying Tesla seems as weird as Sony buying Mazda though. Apple is just not a car company — they're a consumer electronic company (that are, if anything, moving hard into services).
I think Apple has had aspirations to become a car company. There were all those years of rumours about the Apple car project, and they've done a lot of work with car companies for Car Play. Their latest iteration of Car Play aims to completely take over things everything including the instrument panel, if I understood correctly. I don't think Sony has similar ties to the car industry?