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This has nothing to do with the car being an EV. Isn't it?

It's perfectly possible for ICE car manufacturers also to start adopting this "expansion pack for cars" model

They are already doing that. For some Audi models you can order a tuning pack that increases your engine's power and is delivered through an internet connection (e.g. WiFi or built-in phone network). I think this is probably true for other brands as well.

A simple example which I have seen on many cars: "directional" headlights that are actually achieved by turning on the fog light on the side you are steering to. This is 100% implemented in software and uses the fog lights which are already installed (in all but the cheapest variants).

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