Read this at first and re-read what you wrote. Their language is confusing, though what I understood, that money will be from this:
We generate revenue every time our customers swipe Monaco card from the fees paid by merchants (interchange revenue). On average, merchants accepting a payment with a card receive only $97 of every $100 spent by the customer, $3 being split between card scheme, program manager, issuing bank and acquiring bank. Monacos share of the interchange revenue comes in at 1.5-2% depending on transaction profile. Monaco will roll-out new, revenue generating products over time.
That's just bad wording from their side, they mean 1.5-2% of the payment made. How else do you think they can provide 0.75% (even more for platinum) cashback? Basic logic.