Well one must also argue the opposite. I myself have gained immense knowledge from YouTube. I have learned things like phone screen replacements or phone battery replacements. I call myself a mechanic from the school of YouTube and have saved myself at minimum $10k in repairs doing the work myself. I have learned to make endless food recipes or create things like giant bubbles or slime for my kids. My point is that I bet sure for some YouTube is a massive time sink waste of time. But I also wonder how much it has improved the knowledge, skills and ability of others. My dad often mentions how had he had YouTube when he was younger how much it would have done for him. He talks about having to go to the library and if lucky there was a book that could show you the knowledge you were looking for. He says but now you can find not just the knowledge but for example specific knowledge like car make model and year and how exactly to do job xyz. Ultimately I just can not imagine life without the wealth of knowledge YouTube has given me.