include your phone bill, your internet bill..... everything which can charge to a credit card. what you have mentioned is credit card promotion. that's 2 different things
of course S$6000 has no interest, but how much interest can it be?
unless your credit card bill is only a few hundred every months and unless you always save your 6000 to fix deposit, otherwise, the rebate sure much more than the little tiny interest from this S$6000.
and i don't think any other credit card can give as much rebate as this.
even for black card, the points reward is also < 1% rebate.
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