AFAIK they are building a general purpose cloud storage infrastructure for Web 3.0 that is different from current decentralized
storage solutions (e.g. Filecoin, Arweave, etc.).
Its not just a specific storage module (e.g. file system or database). Rather they are building a more complete storage system, or rather, a decentralized Big Data system, to provide more flexible, scalable, and practical data management services for upper layer of decentralized applications.