I think all communications should come under the same rule, as I believe the level of immersion offered on this server makes it stand head and shoulders above any other.
However, it only works with people that are willing to obide by the rules. If a streamer has a viewer that is giving callouts, there's not really anything the streamer can do to control it.
As the current rule states that players who use 3rd party comms will be banned, I feel it would be unfair to ban a streamer because a viewer broke the rule. It may be that the viewer wasn't aware he was on the village server and unfamiliar with the rules