It isn't a lie. Steam takes a cut too yes, but Apple takes a cut after that 30% you mention. You don't pay 30% to Steam from in-app purchases. No one except Apple force you to use its payment system and take an additional 30% cut after the first 30% cut of the app price. Unless you are a small indie developer you end up paying way more to Apple than any other platform.
I don't think this is true. I don't own that many games on steam that offer in-app purchases, but monster hunter's redirect you to the steam storefront, and steam definitely takes their cut of those.
What? They still force you to list DLC in steam store listings and to use the steam system (aka 30%) unless you have a special contract with them like apple does with Amazon.
