There are dozens of companies providing kubernetes with various levels of management, and there are also many companies selling addons. It's a huge market, and Docker captured almost none of it.

Considering Docker literally developed the underlying technology, and a lot of the complexity and capabilities of Kubernetes come from its design, they had a tremendous advantage that was squandered.

Google clearly had a huge advantage too since they have been using containers for years. But Docker certainly was in a good place.