Clever hack.
There are many signs in various shop front windows, on restaurant walls and all over the place that announce " free wi-fi " in their establishments.
Very much like the hack although a bit uncertain who is the likely buyer/ end-user.
Would an auction listing unearth an interested and motivated buyer?
Sign making company, custom signs for chain stores, custom decals, or possibly "free wi-fi"
directories for cities or malls or ????