Agree that APNG is a poor replacement for GIF being mostly used to share video scenes, and VP9, having all those properties, is a perfect one. The only problem

Agree that APNG is a poor replacement for GIF being mostly used to share video scenes, and VP9, having all those properties, is a perfect one. The only problem is that VP9 is still lossy with RGB -> YUV -> DCT -> YUV -> RGB, similar to JPEG at quality 100. It kills it for universal use. Moreover, it's a poor choice for vector animation and there's a high demand for it. But the same applies to APNG and GIF.