Are they actually paying? As far as I know, the power in this relationship is the other way around, with the car manufacturer having to pay (to programmers) to

Are they actually paying? As far as I know, the power in this relationship is the other way around, with the car manufacturer having to pay (to programmers) to build protocol support on their end. Note also what I wrote about AV cars (EDIT: that was an edit a minute or so after, so you may have not noticed).