I think it's negative for every major codec thus far, except maybe VP9 (did any videoconferencing apps use VP9?) H.263, H.264, VP8, HEVC, and AV1 certainly wer

I think it's negative for every major codec thus far, except maybe VP9 (did any videoconferencing apps use VP9?) H.263, H.264, VP8, HEVC, and AV1 certainly were all used by various videoconferencing apps before hardware blocks reached consumer devices.