You should email Louis Rossmann, he's been helping people in similar situations.

This sure reads like a "you did nothing illegal but will attempt to make it look illegal" kind of thing. Like putting the key to a public space under the doormat, with a sign "key here" and then complaining you cannot use that key to access the already public space.

They alleging you have broken their encryption.. DMCA would be appropriate I would assume in this case. OTOH, if there isn't a first party way to get an auth token or a way to connect your car with home assistant, I see that as a deficiency of service.

r/opensource_legalaid let's reply and demand access to the data.