You cheated not only the Subway, but yourself. You didn't grow. You didn't improve. You took a shortcut and gained nothing. You experienced a hollow victory. Nothing was risked and nothing was gained. It's sad that you don't know the difference.
You were, basically, stealing from Subway. They had their rules for their company and you decided not to abide by them. What you do with your own business is up to you but what you did was wrong at Subway.