Jötnar, singular jötunn, are colossal eaters.
They are rust, mould, erosion, withering, getting rid of our surplus creations. Otherwise we would over-fill our surroundings with stuff.
Jötnar are the necessary sweeping-up department.
Óðinn Vili Véi – spur for creation – jötnar – sweeping up – a cycle
Same Jötnar (singular jötunn) on Youtube