I also doubt Ubisoft is part of the issue here. Cyan obviously has the necessary rights for the content and the engine, or they could not use it in their own game. And if they really had to stop CC hacking discussion, a link to the GoW or Alcugs site would be way off, because that's all these sites are about. Just because there is a link in between... does that mean we can link them to any site containing any information, by simply
using a redirection site? Of course not. So either linking to GoW is taboo, or the rules are quite unclear, or they are useless.
modify Alcugs servers to be compatible with the MOUL client
And strip CC support out of Alcugs, so that is is solely about MOULa hacking.
I think at least a big part of the reason why they don't want CC hacking discussion is that the CC hacking got totally out of their control years ago. As long as we don't have to modify the engine, we can do whatever we want, we even have a server which is fully under our control. MOULa on the other hand does not (yet) have an open-source server implementation, and there are only very few people knowing how to get and change the MOULa Python code. No public documentation is available for these internals. At least we have a public implementation of a MOULa prp reader and a MOULa-compatible network layer, but it's still much more under Cyan's control.