Hmm... if you took a model of the user locations on a map, you could get a decent spread of active users in the ecosystem.

with that information, you could promise the funds of this (or maybe matching funds from existing whales) to 'put funds in the hopper' of an algorithm that randomly distributed SBD or Steem to random geoloc coords based on the user density distribution. The amount of SBD and/or steem could be a variable based on needs of market dynamics for balance, particularly to push the SBD peg towards $1.

One important attack vector would be spoofing the GPS geolocs just to run around with virtual devices and gobble things up. it would have to be tagged to something randomized like a QR code of a nonce or passphrase placed by a participant. just like a treasure chest.