When they "open sourced" the Tesla Roadster the website only had a couple of mostly useless files. Discussion at the time https://news.ycombinator.com/item?id=38383099

Despite not containing more than a few random files, there were headlines everywhere about the "Open Source Tesla Roadster". There were countless comments, Tweets, and posts about how amazing it was that the Roadster was now open source.

None of the people reporting on it or praising it actually looked at the files and realized you couldn't actually build anything other than the HVAC control board for the car.