Is the disk space used for anything useful in parallel to Proof of Space? What would have been smarter would be to make the space allocated to Chia also serve

Is the disk space used for anything useful in parallel to Proof of Space? What would have been smarter would be to make the space allocated to Chia also serve as a decentralized, worldwide storage facility (e.g. compete with S3/Glacier). You'd get better utilization of the resource, and have an extra revenue stream for the system.