[blueblisters]

> GPay gained success by offering scratch cards (giving you money) and cashbacks for making payments through GPay.

I remember reading about some anecdote where a network of friends were doing thousands of transactions a day to game the scratch card system. I'm sure they plugged that loophole (if there was ever one) pretty quickly.

[aitchnyu]

Scratch cards "drawing dates" several days after the transaction. Enough time to figure out ring transactions. Google once targeted a friend by making his meal nearly free. He talked about that to several friends for months. His circle got much smaller rewards. Its not truly random.