While they think they are winning, they are actually losing. Their happiness in this world diminishes, and they sustain the damage of the punishment of hell in the Hereafter.
In this respect, the Messenger of Allah (saw) says, "Those who feed on haram are promised punishment." [Tirmidhi, Jumu'ah, 79]
As in every aspect of our life, we should base our business and trade on truth and honesty as well. Let us properly protect the boundaries of halal-haram set out by Allah (swt).