As you know, CBC is a series of institutions held together as a corporation. The most commercial of its activities would be that of the English television network. Somewhere between 40% and 45% of the money comes from the parliamentary grant, and the balance is from commercial activity. Then you have the radio services, which are 100% public.
It would seem to me that this is a subject for research. It would be interesting to see whether the questions coming from one or two business sources are directed at the distinctly public broadcasting part of the public broadcaster or the somewhat private broadcasting business of the broadcaster.