We're active users of PureScript at Lumi (W15). We started experimenting with Haskell on the backend about two years ago and it was a huge success for many of the same reasons stated by the OP. We've now completely moved from Node to Haskell for our API. Since then we've continued to double down on type-driven development and bringing it to the frontend with PureScript made sense. It helps that Phil Freeman, its creator, is on our team :)
We've been dipping our toes into open-sourcing more PureScript libraries, such as our React bindings: https://github.com/lumihq
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We're active users of PureScript at Lumi (W15). We started experimenting with Haskell on the backend about two years ago and it was a huge success for many of the same reasons stated by the OP. We've now completely moved from Node to Haskell for our API. Since then we've continued to double down on type-driven development and bringing it to the frontend with PureScript made sense. It helps that Phil Freeman, its creator, is on our team :)
We've been dipping our toes into open-sourcing more PureScript libraries, such as our React bindings: https://github.com/lumihq