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Is this another outlier when you reach certain scale, it’s more beneficial to roll your own? Pretty amazing what Uber has to deal with.

Also it’s not very clear from the original articles, what is the new total “cost of ownership” of this new refactored service. Like now they need to manage their own databases and the storage backing them. Or did i miss it?

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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.

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