I applaud the writer for his approach to making his own hub for his team. However, this is not a real 1-1 swap. In terms of pure functionality this may be an even exchange; his own platform might meet his needs just as well as GitHub. Yet it lacks major benefit - the community/public aspect of that environment. Duplicating that factor would take too much time an effort when you could just pay 7 bucks a month for the same thing.

Sometimes, while its fun to reinvent things, it just makes more sense to use what's there.