Yes, but it was also owned by MS, a big company. I think closed source language is a terrible business model, especially considering that this model managed to kill several well-known programming languages (Smalltalk, Common Lisp).
It is a clear case of the license hampering the adoption of an otherwise good idea (JSX is so commonplace now, Opa had it already in 2010). But you are right, the actual close source era of Opa was very short.