So that others could watch it also?
Seriously, mnove the camera to the 1st row in the stabds, zoom in a little more and there is NO infraction and they get the EXACT same information.
I say let all of them film anything they want from their side of the field or in the stands.
I have never once attended a professional game (football, baseball etc.) that allowed fans in the seats to video the game.
The TV networks pay big bucks for the 'exclusive rights' so if you pull out a video camera and start taping the action on the field, you will soon feel a tap on your shoulder from and usher and a stadium security officer.