Regarding bandwidth… what if the video is efficiently encoded to less than the file size of a high-quality PNG/JPEG (assuming the image was not optimized itself

Regarding bandwidth… what if the video is efficiently encoded to less than the file size of a high-quality PNG/JPEG (assuming the image was not optimized itself)? Artifacts in heavily compressed video files are often more acceptable than artefacts in highly compressed still JPEGs, IMO.