Cleeds,
It is not like using lossy MP3 videos,; it is MUCH worse. With any video you are hearing the gear in the video, the room, the recording gear, etc., before you even consider what the audience is using for playback. Even if the person shooting the video is a recording engineer, the sound would differ based on the technique employed. I also doubt that $5,000 microphones were used for the recording.
I think you were being too kind in omitting words like “idiotic” in your put down of auditions via YT.