Apple Corporation lost the requirements of companies such as Google and Netflix, and does not support codec vp9.
Video codec av1 developed by the Alliance Open Open Open Media (AMEDIA), which presents such companies as Mozilla, Google, Microsoft, Intel, ARM, NVIDIA, IBM, Cisco, Amazon, Netflix, AMD, Videlan, Apple, CCN and Realtyk. AV1 is positioned as a publicly available and not requiring payment for deductions by a free video coding format, which is noticeably ahead of H.264 and VP9 in terms of compression levels.
/Media reports cited above.