Car makers are very well aware of the lock-in possibilities and execute them already. They were just very slow to wake up to the fast raise of, how to call it, "software defined car", and start pouring endless money now into this.

The car makers usually defined the functions in their car and how to split that to the different computers (plus quite a few of this is fixed to specific computers, anyway). They also defined the data going back and forth between these, at least in part. Everything else was defined and done by the suppliers.

This entire approach was upended by increasingly powerful embedded hardware and possibilities resulting from it, which rendered the entire software stacks in the cars so complex, the car makers had to seize control over this again. Someone has to define the larger scale software architecture in a vehicle etc.

Combine that with that juicy lock-in scenario (I mean the big idea is to have cars connected all the time, like your phone), and you can bet on the fact that the car makers are very well aware of the possibilities which come with that (think of all the data which comes with that). And they are not exactly willing to just yield to the likes of Google or Apple because of it, i.e. we are talking really big money here.

How all this will play out in the longer run, lets see. Car makers sit on a lot of cash, so this will be a fight which will be going for a while.