Slept a night over it. I'm not so sure anymore if this rule is as absurd as I first thought. Crying can have several reasons and not all of them are positive. In my studio days there were girls that broke into tears out of desperation and it happened on cam too. Our studio tricked us to appear on cam (recruiting us as hostesses, then putting us on cam instead) and the penalty for leaving the contract early was very, very high creating a no way out situation.
Also there's the emotional misery trick ("tip me so I feel better") too.
Personally I wouldn't turn my cam on when I'm in a state where I might cry. Tears of joy (happened to me too) are different of course.
Since I'm not a native in English: What does "We hope this finds you well" mean?