In real life, conveyor belts, escalators, moving walkways and similar conveyances are part of certain specialized environments, and serve the function of moving things in a convenient direction. In video games conveyor belts can show up anywhere: in the middle of a forest, in underground catacombs, etc. These belts don't move in a logical direction. They dump pedestrians into bottomless pits. Multiple conveyor belts move in opposite directions to trap players. In short, the conveyor belt in video games often serves the purpose of hindering instead of helping its user.