The US Supreme Court ruled that Apple must allow developers to link to alternative payment systems within iPhone apps.

Developers can now bypass Apple's commissions and direct customers to cheaper payment options outside of the App Store.

It remains unclear if Apple can still collect its 30% commission.

Apple shares fell 2.6% following the news.

The impact on Epic Games' presence in the Apple App Store is unclear, and they are expected to go to trial against Google in Australia.

The Department of Justice is considering filing an antitrust case against Apple.

The changes apply only to the US App Store, while the fight against Apple's app store practices continues globally.