“We’re also sad that Mazda’s first recourse was not to reach out to us and the maintainer but to send a cease and desist letter instead.”
Mazda sent one open-source volunteer a cease and desist and filed a DMCA notice at GitHub to wipe his library and every fork. The code only let Mazda owners read their own car’s data in Home Assistant. It was gone within a day, pulled in the 2023.10.2 patch release. The same week Tesla published official API docs. Mazda decided the data from the car you paid for belongs to Mazda.