ISTR searching through the 'odd pedals' bin in a LBS years ago and they had many more left pedals that right ones, and said that they thought this was because so many people started with the right foot, and that this high stress was the one that either started or finished the job of breaking the spindle.
OTOH ISTR hearing that the GPO used to buy in many more left pedals than rights, because posties broke LH pedals by 'scootering'.
FWIW about half of the worn chainrings I look at show clear signs of the rider having pushed somewhat harder with one foot (usually the right) than the other.
A significant minority of continental pro riders choose to have their brakes configured 'moto', even though that wouldn't have ever been 'normal' where they were brought up. BITD, with non-aero cables, swapping sides was as easy as with flat bars.
cheers