Apple is being forced to support alternative payment systems in a growing number of regions but has made clear that it still intends to collect a commission.

Historically, Apple has charged a 30 percent commission on App Store sales—including in-app purchases and subscriptions. In 2021, Apple is estimated to have generated 85.1 billion in gross app revenue globally.

Apple has faced more scrutiny than most platform holders due to its “walled garden” that does not...