Hello!
If you're looking to make your free space available for use by others, I would suggest looking at the recent announcements regarding Storj and the iX team's pairing with them.
What is Storj? Storj is an open-source distributed object storage Web3 alternative to Amazon S3. Why use Storj? What are the benefits of using Storj? Benefits of privacy, security, performance, and reliability Default eleven 9s of durability with no replication required Zero-trust by default...
www.truenas.com
iX-Storj is only available on the TrueNAS SCALE "BlueFin" at this moment, but availability in other editions is targeted in Q4 2022.