[US] Is MealSlash actually legit, or is there something sketchy behind the 50% discount?

A site called MealSlash claims to offer 40–50% discounts on DoorDash and Uber Eats orders, where users pay a discounted amount for the service to place the full order. The user raising this concern is skeptical about how such a substantial discount is maintained and questions if the transactions could involve stolen cards or fraudulent gift cards.