Comment by nerdponx

It's not a hammer subscription, it's hammering-as-a-service. You ship them the nails and wood, they ship you back the nails hammered into the wood. You don't have to worry about the complexity of storing or using a hammer anymore, let alone the difficulty of selecting the right hammer, it all just works. They charge extra to sell you the nails and wood, to avoid the complexity of packing and shipping your nails and wood.