(b) infotainment systems have always-on cellular internet connections
(c) billboard impression counts can be tied to the vehicle
IIRC infotainment systems are already showing ads in some form. And location + driving performance is being captured + monetized and shared with insurance companies.
Unless this results in an EV car that I can rent for less than $100/mo, this really needs to be stopped.
I think they've got that. Short of budget stuff or the Slate truck, most new cars have some big dumb screen in them at all times.
But advertising poses a new problem for both advertisers and mfgs not unlike the mid-90s ad sale issue. There was no consolidated ad server, so everyone was trying to build their own agency and advertisers had to navigate that.
Which probably means some sort of Google or Google-like player in the space.