That's exactly it. Usually the usage fee goes down with an increase in revenue. So if I buy services/goods from someone in bulk, they give me a discount. But with Google and Apple it is the opposite. If you cross $1M revenue you pay double rate to them! It shows the absolute monopolistic hold they have over the mobile market.
They could have tried being reasonable, but instead they did everything they shouldn't have done. I hope something good comes out of this.