<prompt> Human: As the title says... Taking the example of amazon rewards visa card; It offers 70 giftcard and 5 cash back with no annual fees... whats the catch here? Do I need to sign a contract to keep it a certain amount of time? Do I have to use it every month? How do they intend to make money if you pay off your debt on time?.. Thanks guys.  <response>: Credit card promotions and rewards programs are often solid and reliable. They exist to encourage people to adopt the card. Card issuers are betting that for every responsible cardholder, they will get plenty of people who carry debts and pay interest every month. 