There are likely many people who have not experienced this form of attack. Many who may not have even been aware of it explicitly, and this article may have made this aware of it, and what the common strategy is for dealing with them. That's good, and so many developers user github, so the article likely reaches a larger audience than those "thinking about DDoS hardening".

What isn't useful is the narcissism of your comment, and the assumption is that everything should be targeted at you and people like you.