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.
Decentralized BDS (Minerva) and Decentralized FS (IPFS) are what CATA offers as new infrastructure for decentralized data storage. Definatly its something badly required in decentralized data storage.