Perhaps even more disappointing than following a broken link on a site is coming across a missing video.
This tends to happen a lot with YouTube videos. The post author has carefully crafted a set up for you to watch something juicy or interesting or beneficial, and when you go to play it, you get some type of message saying you can’t.
There are all sorts of reasons for this. Sometimes the video maker has removed it. Sometimes YouTube itself has removed it. Sometimes it’s been set to private. Sometimes it’s been restricted because of your location.