When Amazon competes with Oracle on service, what value will Oracle have to provide? Amazon is far ahead of them in platform, and catching up in service is easy. Oracle would have a much harder time doing the opposite.
Platform-first business model is quickly displacing service-first business model. Build a large customer base, use it as proof of ability to scale, then charge enterprise customers for concierge service.
EDIT: keep in mind we are discussing an article about oracle's declining sales.