Most recent one, to stimulate consumer demand in face of a consumption tax increase and have most of the stimulus hit smaller, "local" operations / core spending:
2) Cities/wards send out offer to residents, offering them a booklet letting them purchase (up to five times) 1~5 tickets with face value 5,000 yen (~$50) for 4,000 yen each.
3) Buy at local PO.
This scheme appears to have at least considered "Maybe people will turn us into a money pump" by rate limiting, requiring ID, threats, etc.
The financial industry has trouble making money w/ negative interest rates and said "Look, throw us a freaking bone and help with customer acquisition for payments revenue; we'll help SMBs have... extremely accurate books for tax season."
</personal opinion>