During Cataclysm ( I think ) a friend and I made horde alts on one of the most populated realms at that time (Stormreaver maybe?, it began with an "S").
Trade chat was worse than twitch chat in a popular stream in terms of the speed it was flying past, but as we were levelling up I write in trade (once) "Hi, WTS low level enchanting mats cheap, new player on the server so would be a great help to get some starting gold" or words to that effect. About 2 minutes later I "DC'd" and when I tried to log in I got some message saying I had been suspended for, I think it was only 3 hours, maybe it was 6, for "spam".
I don't need any further proof that for years Blizzards report systems have been 100% automated without any input from a person. I refuse to believe that will have changed for any Blizzard title since then. "Needless expense" I'd imagine is the logic.
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You got a source for that claim. From what I see its a very tiny (but vocally pissed off) group of players that think the system is broken or flawed. I'm not trying to suggest like Justpassing that there is a definate correlation between being an asshole and taking issue with the system; but the idea that most people who play HotS think the silence system broken or flawed is laughable, most people don't ever encounter it.