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Redis is fast too, but I don't go around comparing it to a proper database =/

/dev/null scales better than all of them

But is it web-scale?

"Mongo DB Is Web Scale" is pretty entertaining: https://www.youtube.com/watch?v=b2F-DItXtZs

(https://news.ycombinator.com/item?id=1636198 linked to the original platform, which sadly shut down after a few years.)

/dev/null : the optimal solution for write-only workloads

It's eventually consistent as well, so same guarantees as MongoDB in that regard.

And it massively improves backup times (let alone, restores)