Road rules exist for a reason. The reason that it’s illegal to pass someone on the right lane is that they might turn right without seeing you.

If you’re in a bike on the road you should be as careful as you can, since you’re a small thing surrounded by heavy giant machines. And those in the cars are mostly only paying attention to other cars.

Cars that are in the rightmost lane don’t expect anything to be at their right, since they are already the rightmost, so they are looking at the traffic coming from their left when turning right, they don’t look at what’s right of them, since there are no cars coming from that direction.