Both this piece, and most commenters, seem to miss the point about where Github's value comes from. It's not for being a social identity for programmers, or hosting open-source libraries. Those are worthy pursuits, but from a business perspective mostly serve as marketing. Github is basically Microsoft Word for programmers, and is an essential part of their workflow. Companies that need enterprise functionality aroun…
Atlassian has an interest in dominating the enterprise-side with JIRA (issue tracker) & Confluence (wiki). Atlassian's Github non-Enterprise competitor, Bitbucket, has unlimited private repos for free or $200/enterprise. Atlassian also offers FishEye/Crucible and Stash to compete with GE.
The big plus with JIRA/Confluence are the plethora of free/paid plugins and lots of enterprisey features that aren't available in Redmine/Chili, Trac, etc. without significant work. In those circumstances, IT shops appreciate Active Directory provisioning, fine-grained permissions and such when any of mediawiki, google docs/quip, asana aren't often up to task without lots of extra work. (Yes, deploying Atlassian to production used to be a PITA, but it's much better than it was some years ago.)
Atlassian's HipChat is basically a 37signals' Campfire clone, and Slack/FlowDock are significantly better for most use-cases.
In the CI market, most shops end up deploying Jekins/Hudson because of it's cross-platform slave builder agents and massive plugin ecosystem. I wouldn't use Bamboo. CI needs to be deployed when enterprise can't use TravisCI or similar.