Bucklescript has caught on to some extent. Its sister syntax ReasonML is getting a little traction which means that Bucklescript is getting a little traction as they share the same build chain.

Facebook Messenger is built using Reason. A few other smaller companies are using it too: https://reasonml.github.io/en/users-of-reason

Wow Air were using it though one probably can't blame that for their collapse.

I guess that list doesn't include straight Bucklescript users either. There are definitely companies out there who use it outside of Reason so the OCaml, in general, is getting some use in industry which is nice.