It's not possible to just make someone say something. Someone being unable to talk is also not possible.
#Controller
waxen axle
junior gate
So then what’s with the server messages being sent by random players? Couldn’t you just use that?
waxen axle
That message is always sent by the player with the lowest ID.
junior gate
Well how about this then? Messages from both the controller and player appear to be sent by the player with the lowest ID, and there is a message at the beginning of the meeting clarifying this
waxen axle
Someone being forced to say something could be possible. But silencing someone isn't.