I worked for a company which used Redis at the prototyping phase, but then wrote own database to improve performance and resilience. The company wasn't selling an end-user facing product, the product was a distributed filesystem.
My take on this is that most companies don't have the expertise to build systems like databases, and even if the costs would otherwise suggest such a development as desirable would be simply afraid of doing it.
My take on this is that most companies don't have the expertise to build systems like databases, and even if the costs would otherwise suggest such a development as desirable would be simply afraid of doing it.