In every case I can remember, the community-centric forks outpaced or altogether outlived them. Hudson is dead. OpenOffice is basically irrelevant. Oracle ZFS sees little interest and is not what anyone thinks of when they hear 'ZFS'. But Jenkins, LibreOffice, and OpenZFS are all going strong many years later.
This could end up being a really good thing for Terraform users, would-be contributors, and Terraform itself as a technology. I wonder if any Terraform maintainers from HashiCorp itself will jump ship to work on it full time as OpenTF. A similar phenomenon ended up being a decisive factor with the post-Oracle forks of Sun software IIRC.