I think Stratchery made a mistake in think this is about open vs closed source, but rather it's down to Amazon's desire to own core infrastructure. Amazon want

I think Stratchery made a mistake in think this is about open vs closed source, but rather it's down to Amazon's desire to own core infrastructure. Amazon wants to have an offering in every major database category. Whether you're open source or closed source, it's safe to assume if you get decent marketshare Amazon will come after you. Even if MongoDB was proprietary Amazon would have built a competitor in this space.