If we came to the conclusion that this was happening there would be a discussion with the successful consortium to seek what remedy was available. Within our mandate we do not have enforcement powers to step in and say thou shall not do that.
In the U.S., the commission on debates, because it is the producer and disseminator of the debates, has a greater degree of control over all the things you mentioned, including the venue, the format, the moderator, the type of questions, the themes, etc.