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Alternatively, Datomic wasn't performing up to snuff, and they found it cheaper to buy Cognitect than do a DB migration :D

Do those companies specify what they use it for? They probably have their own internal "small-ish backoffice systems".

Nubank is one thing, but for Netflix, just like for any big company 10000 DB technologies are probably in use at the same time.

And 9996 of them are used for stuff like the internal HR DB or other minor projects.