I can understand why the channels are moderated. It kills the immersion if juvenile crock gets spewed on you all the time. Heck I even muted CH200 for the first time of my life some time back as I got tired of watching RManiac and his fanboi whining about some kill.
In real life radio ops were pretty restricted and you had to remain decent on them on most times.. Although in combat I think nobody could care less about rules. I haven't heard any recordings of an actual fight.