Only Storj Inc. can use it on the network efficiently though. Everyone else is bound to use what Storj Inc. provides if they want to get any money from the main network.
Well, piece store can be made to require for metadata less than 1.3 GB / 1 TB of pieces, which is what @alpharabbit observes in post above.
I did describe how to ball-park the required amount, hope you’ll find it useful.