Re: SourceForge is so dated
I prefer SourceForge to github for a handful of reasons. One, as Avalanche said, is inertia; I have projects on SourceForge already and don't feel like spending any effort to move them.
Another is that we use Subversion at work (and it's fine for our purposes), and switching between Subversion and git is a bit of a pain - cognitive load I don't need. (And to be honest I'm not terribly fond of git except when I need the features and behavior that Subversion doesn't support, or doesn't do well.)
And in my limited experience it's easier to make a fairly user-friendly project page on SourceForge than on github, which is useful if you're creating projects that have a lot of non-technical users.
Ultimately, though, I just don't buy the "SourceForge is outdated and github is shiny and new" argument. The adware issue (and I agree it's a big one) aside, what actually makes github better? You call SourceForge "crusty", but what does that actually mean?