The problem for digital currency is it doesn't enable any popular activity. And all my marketing thoughts have been about how to find killer apps for digital currency that users will clamor for.
You're looking at the problem from the wrong country. The unbanked are your users. Users who's governments are so corrupt that their national currency is basically unusable.
Well the peso is usable for cash transactions. The unbanked only lack the ability to transact online. That is where the action is in terms of marketing to them.