Because the Opal project is ran by sensible maintainers. The point of this link is to showcase the kind of people that want CoCs to be a thing. If you read the

Because the Opal project is ran by sensible maintainers. The point of this link is to showcase the kind of people that want CoCs to be a thing. If you read the comments on that issue you will see that the PC warriors are trying to pressure the project into adopting a CoC which would make the behavior that upset them unacceptable. To be clear, the behavior that upset them was a contributor tweeting things on twitter under his private name. They wanted this person to be removed from the open source projects they were working on because of that. The people who are pushing CoCs want to be able to punish people for perceived injustices. These injustices can be tweeting on twitter, and if the PC warriors get their way the punishment is to be ostracized from all open source projects.