Comment by xmcqdpt2

Reading direction maybe? Right-handedness being the norm? Culture? The effect is well-known

https://pubmed.ncbi.nlm.nih.gov/31242803/

Most people if they are to draw a vehicle in motion will draw it moving right. Most (all?) side scroller are rightward. In fact I can't think of a platform side scrolling video game where the primary motion occurs to the left. Most cars advertisement have the car moving right. It makes sense that generative systems would draw motion to the right.