Hello Brookit, this isnt for console games or even PC games which I believe are the ratings you are speaking of. This section is for online gaming specifically.
we judge PG-13 by a couple of factors. First, most online games fit into two categories, COPPA friendly or 13+ only.
The other factor is if a game is unmoderated, even saying if the terms of service state its 13 friendly, we put it in the not family friendly category and close the topic.
Hope this clears it up.