Just going to requote an old quote from Vrakthris, and I think the same thing actually still applies today:
Basically, yes, some channels does have some rules in regards to in-game advertising as far as I remember, how ever, there isn’t really any rules in regards to having discussions within a such channel, even if the discussion is about politics, as far as I can translate with Vrak’s quote. Of course their is rules in regards to communication, but the rules is basically not being vulgar, or using profanity, etc.