Good point, but in practice I think the only way onboard data could be exfiltrated is by a dealer while the car is being serviced. If you DIY or hire an independent mechanic, this seems unlikely.

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throwway120385 2 hours ago | parent [-]

Or by the FBI, NSA, CIA, DHS, or some other interested entity.

	▲	willis936 2 hours ago \| parent [-]
		If a TLA is interested in you then you don't need to worry about a data log in your car.