Filecoin, Sia, and Arweave are three of the bigger chains involved in decentralized file storage. A combination of IPFS for data verification and one of these services for storage is typically enough. Many apps will store both on S3 and on Filecoin and link the IPFS hash for redundance. It's not a pyramid model, the native tokens are used to purchase storage and incentivize the bootstrapping of the storage network build out. Arweave has created an endowment like structure to guarantee data storage for 200 years.