It's a bot to enforce originality. Say something in the channel that has been said before, and you get devoiced for 4 seconds. Say another something that has been said before, and the devoice quadruples. Not just something that YOU said before, something that ANYONE said before.
Die Konstruktion internationaler Politik in den Bildsequenzen von Fernsehnachrichten. Quantitative und qualitative Inhaltsanalysen zur Darstellung von mediatisierter und inszenierter Politik