The other benefit is that it removes the HDCP encryption. To recall, the HDCP encrypts the signals to prevent such that we can capture the screen contained. This is the case with consoles for example of the PS3 / PS4 and Xbox.
Thus the utility for a YouTuber is to recover its gameplay in a port and store it on your PC with a GameCaptureHD Elgato for example. The port # 2 is when with him for TV and thus provide gene without playing since the TV will receive exactly the same signal.
Basically, the PS3 is the branch splitter, the splitter then transmit two signals in which HDCP is no longer existing.
A signal is plugged into the capture device and a signal on this TV. And it's done.
