He doesn't disclose much information, but it looks a bit like he (sourly) blames the industry and community for something that is very common elsewhere too: to run a public forum or mailing list, you now need not only the users' support and goodwill, but also legal counsel, a thick skin and willingness to challenge legal threats, as well as all sorts of technical means to fend of malicious activities (DoS/spam protection etc.).

What's stopping such communities from going "underground", i.e. to some darknet where anonymity and protection from some of these hassles still exists?