I think there may be some misunderstanding on what constitutes “the community” and what “force applied” mean in this context.

In any self-governing body, there are written and unwritten rules of conduct. Nobody has any power or ability to force anyone to stay and participate in the community at all, so they literally have no power to force anyone to do anything. The only power they do have is conditional, and boils down to, “Anyone that wants to participate in this project must conduct themselves and their work by the guidelines we dictate.”

If there is a rift, and there is not consensus on what those guidelines should or should not contain, the smaller or less contributing group is no longer “conducting themselves and their work by the guidelines we dictate”, so their contributions are no longer accepted. The out group has not been forced to do anything at all, and is free to copy the project at the point of contention and take it in the direction of their own vision, setting up their own code of conduct and submission rules.