The brake can fail, posing a crash or fall hazard to the rider.
The right hand wheel hub mount can bend or break and cause the rider to lose control, posing serious crash and injury hazards.
Water can enter the controller and cause it to accelerate unexpectedly posing a crash and injury hazard to the rider.
The snap pins can become loose and fall out causing the rear wheel cup (and rear wheel) to detach from the main frame. Prior warnings of this defect may include sliding or banging noises when the rear wheel and wheel cup hits the ground. This can result in a bicycle ejection, causing a crash or personal injury to persons outside the vehicle.