If it were just 720p then that might be acceptable but typically is a pixelated mess. As the Reddit poster mentioned and as I was told by Apple, they don’t know why this happens. I worked with them for a very long time having long phone calls sending all sorts of data. Eventually I just gave up. Example: my friend will send me video and it comes through not pixilated, super crisp and clear as if I took the video myself and were watching it in photos. As opposed to when I send a friend a video, it looks like garage when they view it.