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Hi Geoff,

(From the WSJT / WSPR modes home page.

Description

WSPR implements a protocol designed for probing potential propagation paths with low-power transmissions.? Normal transmissions carry a station's callsign, Maidenhead grid locator, and transmitter power in dBm.? The program can decode signals with S/N as low as -28 dB in a 2500 Hz bandwidth.? Stations with internet access can automatically upload their reception reports to a central database called WSPRnet, which includes a mapping facility.? To see a live version of the map pictured at top right, click here.)

My take is....

WSPR is useful as an own use propagation tool, I have used it since approx 20I0 having seen the work of W3PM / GM4YRE (?)
In all that time I have never used the WSPR mode intentionally for the purposes of communication for which it is not suited.
WSPR was conceived / is used as a one way RF based uplink mode having reserved allocations on specified Amateur Bands, with confirmation back from a remote RX station to the TX station provided via IP / internet?
As a by-product of acepting these terms of use, a database entry is available for free use to anyone having an interest, not necessarily restricted to licenced Radio Amateurs.

Alan