The NFT staking puzzle is just a flavor of the DIG Rewards Distributor that will pay $DIG to DIzg Nodes for mirroring data stores. All the on chain mechanics are the same. It's the puzzle that made the existence of $DIG even make sense.

Data publishers collaterize their data with $DIG, DIG Nodes earn $DIG for mirroring data. Nodes sell $DIG to data publishers for collateralization. Value is derived from the demand for a censorship resistant planet wide decentralized content delivery network.