It has and there are various theories:
It was invented in Britain where we drive on the left. This puts the drivetrain away from the kerb which is good for some reason or other. The rest of the world was so in awe of Britain at the time they followed suit. I'm not sure I buy this one. I can't particularly see the advantage of having the drive train away from the kerb, and if there
was such an advantage then continental Europe and the US would have put it on the left - industry wasn't so globalised back then.
Most right-handed people prefer to mount from the left, by raising the right leg over, and choose to wheel the bike by holding it with the right hand , and standing on the left of the bike. This puts the oily stuff on the opposite side to the rider. I guess that's possible.
It's due to the coriolis effect. But bikes in Australia are upside down so right is left and left is right.