Meta's codec avatars all have a green cast because they spent millions on the rig to capture whole bodies and even more on rolling it out to get loads of real data.
They forgot to calibrate the cameras, so everything had a green tint.
Meanwhile all the other teams had a billion macbeth charts lying around just in case.
Also, you'd be shocked at how few developers know anything at all about sRGB (or any other gamut/encoding), other than perhaps the name. Even people working in graphics, writing 3D game engines, working on colorist or graphics artist tools and libraries.
They forgot to calibrate the cameras, so everything had a green tint.
Meanwhile all the other teams had a billion macbeth charts lying around just in case.