Slight aside, I remember reading a post here on HN; the poster said they created an astronav system for use with webcams and published the code on github, only to receive on knock on their door a little while later from somebody who explained that this code in fact violated ITAR restrictions and they needed to remove it.

Astronav systems have expensive moving parts that aren't very githubbable. There was an SDR software defined radio passive radar project that got taken down. https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...

Reminds me of https://hackaday.com/2022/11/19/open-source-passive-radar-ta...

Would that hold up in court if the person were willing to challenge it? That seems a clear cut violation of that person's speech, but I guess anything for "national security".