I left some of the early parts of my thought process out of the conversation.

My thought process went something like this: "This is a feature that is currently, probably accidentally, causing vendor lock-in for github users, as there is no easy way to take a project in its entirety back out of github, if it has enabled this feature. That kind of lock-in has been used in the past, by vendors across a wide spectrum, for evil purposes. Github, were it ever to become evil, would find this the kind of thing that would screw users and produce profit."

I don't believe github today has evil intent (though the author of the article seemingly does believe that), but I reserve the right to be skeptical of what the company's intentions will be in the future. Just as I should have been more skeptical of the the future intentions of SourceForge in the past. I think my position on this is entirely fair to github (which is a company and product I like), but I'm also trying to not to be a total sucker and make the same mistakes over and over again.