Every single Intel GPU they ship in their computers has supported VP9 decoding for years. OTH, AMD GPUs they use in some models do not support VP9 in their DSP

Every single Intel GPU they ship in their computers has supported VP9 decoding for years. OTH, AMD GPUs they use in some models do not support VP9 in their DSPs; under Windows, AMD used a shader-based decoder for DXVA acceleration up until models with VCN (Raved Ridge APUs), which do support VP9. They have just chosen not to expose it to the userland. In past, they did something similar with Microsoft's VC-1 too: there's not a GPU that doesn't support VC-1 hw decoding, but Apple never exposed it either.