fake, the issue would be – taking advantage of someone. Seller is not allowed to overcharge more than 1/6, but so does the buyer. Credit card offers are done in order to entice you to use the card long-term. It is OK to try it and then decide not to keep. But routinely taking advantage of these offers means you are taking money from people. I guess it depends on the terms of the offer. If the offer is – 2% rate for one year, you are not taking money, just getting good terms, but if the offer is $200 cash or free flight, then you are taking money from someone without giving anything in return.
and what is 5/24 rule? I am afraid to google or chatgpt