I wanted to let everybody know, since it isn't commonly known, that pretty much all cars past 2005 contain a hard drive which records location, acceleration, and other data. They are commonly used in car theft cases and insurance claims. From the forensics guys I've talked to, they noted that some modern systems phone home to the manufacturer, but that data is rarely made available to the police. You pretty much cannot buy a modern car without one of these hard drives. Stay safe and if you have questions I can try and answer.
I haven't heard of anyone using this to prove that someone was at a protest ect, but I would expect it in the future. The cops do need a warrant for this and because getting to the drive is a fairly destructive process, they will (generally) actually get one.
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Yeah, I'm pretty much going to stick with 90's cars till I die. From the people I've talked to that do this work, they said that the earliest cars they see that they are able to do anything with are 2005.
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Public transit definitely has the privacy by obfuscation angle. And I have to wonder if that won't be a way that people secure themselves in the future- eg tapping the link between the ecu and infotainment and pumping in massive amounts of junk data.
It seems like most of the ev conversions stuff you can be pretty sure about it not spying on you, luckily.