If true (I'm not sure), this is kind of economics in action. There's a monopolistic market maker, screwing every last cent out of providers, with enormous power imbalances. The market maker is semi monopolistic, the labour is low-skilled, with little bargaining power and few better options. The "winners" are shareholders of the company and to some extent the end customers (who, other things being equal, would have to pay more for the labour).
In other words, I see this not a special greed of this particular company, but a logical conclusion of the economic system it operates in.
(I'm not saying it is good either. Only that raging against the symptom is a bit misplaced, and instead you should focus attention at the causes).