Actually, a lot of the Japanese car companies are built on vertically integrated companies where a parent (usually a bank) company owns both the primary company (Honda) and a set of complementary companies that provide things like Windshields or Tires. It's called a Keiretsu.

Then maybe they should keiretsu their way to software because whether they're a software company or not they make shitty software. And either they can make good software or they can buy good software, but if they make shitty software they're a software company, just a shitty software company.