A lot of it is based on my experience with a game that I tried to do together with Kirill Vainer, the lead developer of jMonkeyEngine 3. Some GDnet oldtimers (well now, it's only a couple years ago) might remember "Radakan". Funnily enough, this game was in part the beginning of jME3, and I might write about just that and other benefits of open source game development in an upcoming article.
Last fun fact: This article was based on a answer I previously typed up over at gamedev.stackexchange.com:
Where to look and begin with open source game projects
It came to mind a while after just as a random pop-up in a conversation with the jMonkey team, and I realized an article could be made of it. I'm sure several others could do the same with some of their more memorable rants over the past few years, am I right?