We need a new word for this.

We say OpenTF is (or will be) a fork, and forks are bad, nuclear option, etc, but really, Hashicorp are the ones who made a breaking change, and the "fork" merely maintains that which already was, but for reasons, are not allowed to continue using their own name.

We need for the shortest sound-bite 3-word sentence to the non-technical to somehow use terminology that says that the entity that caused the problem is the one who did some action.

OpenTF did not (or is not prepareing to) fork this project, Hashicorp did.

If it was me and I wasn't legally prevented by something actually binding in writing with signatures, I'd even keep using the original name and duke that out.