This is somewhat surprising, in a good way. A lot of large companies are pretty risk averse, and this prevents them from releasing the source for their shopping platforms into the wild. I'm sure there are some differences between the open source version and what they actually run.

Is this the complete platform? What's held back? I would think the analytic tools for usage and sales, how they store user data, and perhaps whatever they use to build profiles about individual users' shopping behavior. But that's just speculation.