alt Hacker NewsFor a moment I thought he was an immigrant from a post Soviet country. A very unusual arrogance, carelessness and Robin Hood complex for a German. It's wild to imagine a German behave this.
Unless absolutely necessary, do not get involved in any legal battles or anything potentially involving lawyers. Not getting involved is always less expensive and less problematic. Unless your ass is covered by some big and influential organisation; never fight on your own. No one was dying here; people's lives were not in danger. Acting hostile and poking a company to sue you won't bring you anything good. His post won't make waves big enough and he might lose clients instead of gaining them.
Not sure what the name of your complex is, maybe groveling deference to legalese? Whatever it is, I'm sure I would have applied it to your entire country of origin if I knew where you're from, and if I were developmentally around the age of twelve.
He did everything exactly by the book and in the end was even nice enough to not publish the company's name, despite the legal threat being bullshit and him being entirely in the right.