There's nothing to copy. Apple's iOS Camera app already uses multi-camera image fusion in many cases. This app builds on the Multi-Camera AVCapture feature that Apple opened up in iOS 13.

https://developer.apple.com/videos/play/wwdc2019/249/

Apple has done this (multi-camera/spatial fusion) since 2016, in addition to multi-frame/temporal fusion. The OS decides whether these techniques are worthwhile for any given shot based on context.

https://developer.apple.com/documentation/avfoundation/avcap...

They might acquire it and have done it in the past.

https://www.theguardian.com/technology/2014/jan/06/apple-buy...