It's from the linked rav4world post

> One caveat, if you use bluetooth to connect your phone to the car DCM will use your phone to connect to the mother ship and presumably send your data. I only use my iPhone cable to connect to the car which does not have this effect.

A random post on a forum is not evidence that Toyota has found a magic way to exfiltrate data over a bluetooth connection without turning on hotspot/etc.

	▲	throwway120385 2 hours ago \| parent \| next [-]
		RNDIS was a mechanism for tethering over USB, and you could certainly pair "Bluetooth Network Adapters" for years and there's a profile for it. So there's at least precedent for it. That makes it pretty plausible to me.
	▲	tadfisher 3 hours ago \| parent \| prev [-]
		It's not evidence against it either. Presumably CarPlay and Android Auto could implement a network interface through the application layer, or even activate Bluetooth tethering at the system level as they are privileged apps. But they could also do this over USB, so something doesn't add up.

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venussnatch 4 hours ago | parent | prev [-]

There's no basis mentioned there either. It's just stated as a matter of fact without explanation.