Interestingly enough, Apple cutting its rate could be seen as predatory. Especially if their cut rates drove customers and developers to drop Android to focus on iOS due to the rates being so much lower than any competition.When the App Store was first announced Steve Jobs said Apple would run it at break-even. Heck even Phil Schiller said Apple should cut its rate once the App Store hit a billion in annual profit. Of course that was before iPhone sales growth stalled and Apple needed to find another way to grow revenues.
The main reason why there’s still been no successful action against Apple in the US is because Apple’s taken no actions other than making devices/services and iterating on them over time in order for people to spend money on their devices/services. Now, if Apple had bought up Android hardware makers and then shut them down, that would have been a red flag. If they’d told software developers that any app they release on the App Store must be exclusive to the App Store, that would have been a concern. If they had pressured wireless carriers into canceling contracts with other hardware vendors before they could carry the iPhone, that would be part of a complaint. If they had taken any of these or other actions that roughly match the patterns of how other companies have illegally attained their profits, it would have been open and shut by now. Instead, Apple’s influence is limited to people that use Apple products.
Apple has been able to build a customer base that, while far, far, smaller than the worldwide Android base, drives Apple’s commanding profit share. There’s a looooot of companies/governments that want at that tiny chunk (15%?) of the smartphone owning population.