Sarah Perez, writing for TechCrunch:

Spotify claims Apple may again be in violation of European regulation, the Digital Markets Act (DMA), which requires interoperability from big technology companies dubbed “gatekeepers.” This time, the issue isn’t about in-app purchases, links or pricing information, but rather how Apple has discontinued the technology that allows Spotify users to control the volume on their connected devices.

When streaming to connected devices via Spotify Connect on iOS, users were previously able to use the physical buttons on the side of their iPhone to adjust the volume. As a result of the change, this will no longer work. To work around the issue, Spotify iOS users will instead be directed to use the volume slider in the Spotify Connect menu in the app to control the volume on connected devices.

The company notes that this issue doesn’t affect users controlling the volume on iOS Bluetooth or AirPlay sessions, nor users on Android. It only applies to those listening via Spotify Connect on iOS.

Who should get to decide the rules for how the hardware volume buttons work on iPhones and iPads? Apple, or the European Commission?