Overzealous attempts to protect copyright.
++++
Yep. But it is still surprising to me that it not more widespread.
Look at the Roy Orbison Black & White Night video on YouTube. I bet it still sells as a DVD. (They sold me one long ago). But you can watch it for free on YouTube.
Strange business model.
That Black & White Night Roy Orbison series is a true classic filled with very notable musicians above and beyond Roy Orbison himself, it’s truly awesome and just about any aficionado of music who appreciates him would like to have the best copy of that performance that can be acquired, so I’d imagine they do rather well selling them. Leaving the low resolution copies up on YouTube actually sell the high resolution copies. I know I was completely unaware of it, before I saw it on YouTube.