Since the Sorenson Video 3 / QDesign Music 2 fiasco in the 90ties, Apple has pushed hard for MPEG codecs, and when they were insufficient, for homegrown solutions (Apple Lossless).
So they ignored free codecs, like Vorbis, FLAC, Speex, VP8, VP9, they would ignore Opus if it weren't in WebRTC (and still doing everything possible to contain it there), they are ignoring mkv containers, and also non-free codecs like VMA and VC-1. They know that ignoring AV1 in the future won't be so easy, but until then, they will continue push for MPEG and make use of non-MPEG harder.
So they ignored free codecs, like Vorbis, FLAC, Speex, VP8, VP9, they would ignore Opus if it weren't in WebRTC (and still doing everything possible to contain it there), they are ignoring mkv containers, and also non-free codecs like VMA and VC-1. They know that ignoring AV1 in the future won't be so easy, but until then, they will continue push for MPEG and make use of non-MPEG harder.