> This way they'll make money after the limit takes effect. My assumption is that they are hoping the consumer will forget there's a hard limit to the amount they can save and always go with their "5% cash back card" when making purchases.

And that assumption is exactly what I'm saying isn't universally true. My entire point is there are customers who just rotate cards instead of still using it for lower cash back. Who do this for years. Without racking up any interest. Why do those customers' accounts get kept open?