Is this rude to do or wrong of me?

Pizza Hut has this deal where you get 20% off your first online order. So what I do is make a new online account every time I order. I order for carryout so the physical address doesn't matter. This way I get 20% off every Pizza Hut order. Today I just picked up a pizza for Marlene Dietrich lol. They don't notice because I only get pizza about every other week and the employee turnover rate is high at Pizza Hut.