Front-facing characters can look strange depending on the art style, and so people usually draw their character refs at some sort of angle, provided they have the ability to do so. Perhaps the population being primarily right-handed is why they typically face towards the left, as zoomzoomcacapooshitties don't know how to flip their canvas, and it's easier for them to draw that way (I assume.).
I have a tendency to draw all of my characters/subject facing towards the right, but it's ~7:3, rather than 100% of the time.