Not really a good justification for not using GitHub. If your SVN server goes down, you're in a lot more trouble than the few times GitHub is unavailable. At least each user has a full working repo and you can always prepare alternate remotes to share commits. You are apparently already aware of GitHub for Enterprise. I suppose your organization is in full control of your data centers, private cloud, etc, but rationalizing about svn and trac completely stumped me as to your point about "corporate software pushers..."