Because only the iPhone 15 Pto series chip has hardware decoding support for AV1. You’ve had to have code for fallback support for other codecs for years. And

Because only the iPhone 15 Pto series chip has hardware decoding support for AV1. You’ve had to have code for fallback support for other codecs for years. And let’s not pretend it’s been available for Android forever. Chrome for Android just received support for AV1 last month as did Firefox for Android. And Opus support has been around since iOS 11 https://caniuse.com/opus https://caniuse.com/opus