UPDATE (Nov. 10): More excerpts from documents cited by Enquête, and reaction in Quebecor media outlets added below, including one in English from Éric Duhaime.
"Il est aussi clair dans notre esprit qu'un groupe de presse rival peut poser un regard critique sur un autre," Enquête host Alain Gravel writes in a blog post published hours before his show's report on the Quebecor media empire (also viewable on tou.tv). "Ça se fait partout dans le monde. Sinon, qui pourrait le faire?"
It's a good question. There are few journalistic enterprises here with the resources to pull it off. Maybe La Presse, but it suffers from the same problem as Radio-Canada of being a perceived enemy of Quebecor. An anglophone media outlet like the Globe and Mail or Toronto Star or Maclean's might, but this story needed to be told in French.
Aside from La Presse and Radio-Canada, the only big media left in this province are all owned by Quebecor. And that's kind of the point. A study by Influence Communication done for Enquête shows that these three media companies produce 83% of the journalism that Quebecers consume. Though Quebecor is the largest of these three groups, the problem of media concentration concerns all three.
Gravel pointed out right off the bat how delicate the report would be, because Quebecor owns TVA, which competes directly with Radio-Canada. It's an important point to keep in mind, and certainly No. 1 on the list of issues Quebecor would bring up in response.
Fortunately for us, Enquête has pretty solid journalistic credentials, and isn't about to say something unless it's been verified.