This was interesting:
Srikanth Nadhamuni, chief executive officer of Khosla Labs, said the best way to think of the project is by comparing it to how shampoo was introduced in India. Decades ago, most people couldn't afford to buy an entire bottle of shampoo, so Unilever, Procter & Gamble and other companies sold them in small sachets that people could afford to buy, paving the way for marketing everything from detergent to toothpaste in rural areas. Nadhamuni is betting that the new digital payments system will be be low-cost, high-volume, like a "shampoo-sachet revolution in the financial sector."
Perhaps this tech could help with micropayments elsewhere.