The path is obvious, is it not?

Having two independent cellular modems in a car is obviously silly, so it only makes sense to use the same module both for the mandatory emergency calling and for the telemetry.

Because the emergency calling is mandatory, it'll of course be made impossible to disable the modem - and by extension the telemetry. Oh, you disabled the telemetry? I bet that'll be called "tampering with safety equipment", and your insurance is now void, and your car is no longer road legal.

If the law doesn't mandate that eCall has to be fully independent, it'll 100% be used to spy on you.

> Having two independent cellular modems in a car is obviously silly

They should put mandating exactly that into the law.

But the EU can just (and maybe already does) mandate that such telemetry must be opt-in by the user, and on top of that the data collected that way must be treated accordingly to the GDPR anyway.