I don’t want to say that’s an absurd question…but yes, yes they do. It’s what they do.
Apparently it's a source of disagreement and could use some Powers That Be perspective:Does ComStar broadcast media made by parties other than ComStar across its HPG network?
And ComStar's illusion of neutrality wouldn't have lasted 250 years if they refused to carry the state-generated informational broadcasts (i.e., propaganda) of places like the Combine and Confederation.