However, I don't believe that most companies would just handle problems like this in a case by case basis. IsTumblrDown made some noise, and that noise led Tumblr to recognizing a flaw in their process. At the very least, it'll make them more cautious going forward. Incidents like this can lead to long-term improvements.
It means that legal departments have to stop the "shoot first ask questions later" strategy
It's very easy to just go around threatening legal action against people unchecked.
HN can be one scary angry mob which is nice to be backed by, but horrible to be on the end of. Remember the Aria Richards debacle which was heightened by this community. Just one of many. (That wasn't my intention by the way and everyone's been pretty calm.)
The HN effect is a strange one. :)
To use the indelicate phrasing of my first manager, bay area tech is highly incestuous.