I mean, take TVs. Pretty much every TV has "smart TV" features embedded, to the point where it's hard to find one that doesn't. I suspect this is because the manufacturer gets some kind of kickback from streaming services to include their app and to show ads and to gather data about what people are watching and in the end it's actually cheaper to include an embedded processor than it is to leave it out and lose their kickbacks.
Similarly, those "smart car" features can be monetized by collecting valuable data and introducing subtle suggestions on where to go. It's hard to imagine a car company seeing the kind of revenue that Facebook and Google pull in and not wanting to get in on that. And they can even justify it as good for their customers by saying "we need these computers to collect training data so the self-driving features we deploy in the future will be better and safer."
I can imagine a future where "dumb car" features are actually luxury features. Only high-end cars lack the smart car features because it's cheaper to include them than leave them out. Maybe that already describes the present.