Also known as a no-loss lottery, it is attractive because it functions both as a game of chance (as there is a chance of a large prize) and as a savings vehicle (unlike in normal lotteries, the deposit is never lost).
Depositors deposit UST into Glow Lotto and are awarded lottery tickets proportionally to the size of their deposit. These tickets are recurring which means that they will be valid for every lottery until you withdraw your deposit (i.e. tickets rollover to the next lottery after each lottery execution without any action required from depositors).
Deposits are placed in Anchor where they earn ~20% APR. 25% of this yield (~5% APR) goes back to the depositor, while the other 75% of this yield (~15% APR) goes towards the lottery pool. This means that unlike in normal lotteries, depositors never lose their deposit and are always making money even if they never win the lottery.
The lottery is drawn every Sunday at 20:00 GMT, when the interest accrued since the previous Sunday is split among the winners of the drawing. They win big!
If a depositor wants to spend some of the money they've earned, they can withdraw some of their appreciated deposits at any time.
The lottery drawing is conducted following a decentralized and non-predictable process. This allows Glow Lotto to deliver a fair lottery without relying on any central party. Nobody, including Glow Core team, can predict the winning ticket combination.