> I'm unaware if he's weaponized Tesla vehicle access in this regard, but welcome citations, if they exist

Before the Model 3 was announced, a curious user poked around his car's network, and found multiple references to it, which he leaked to a news site.

Tesla responded by remotely forcibly downgrading his vehicle's firmware to an older version with no references to the 3 (presumably so he couldn't make any further discoveries), blacklisting his vehicle from getting any firmware upgrades, and to make sure he didn't try to thwart that, disabling the ethernet interface.