When I looked [1], it reads as if they have an 8 TB cap on this service. That is, you can ship them any drive, up to 8 TB, to plug in and run at $10 per month. It sounds like their pricing is predicated on some kind of assumed Watt-hours per TB.

It would be interesting if someone offered a similar plan, but priced on energy consumed instead, giving incentive for managed storage arrays that power down drives that idle (for some algorithmically-derived definition of "idle", trading off against projected lifespan of the device due to increased power cycling), and other energy-saving practices. Slices up the granularity of cloud hosting even finer.

[1] https://www.delimiter.com/slot-hosting/