Looks like someone forgot to put incentive compatibility constraints to their pricing optimization problem
That said, it almost breaks even after the first month and pays off for itself a week into the second month. To eliminate this incentive, I'd suggest setting the cost of egress at (or below) the cost of storage.
It also would make more sense to me as a prospective customer that I'm not paying crazy overage fees, and I'm paying as if I reuploaded the same data and downloaded it an extra time.