I personally never look at the videos because they only display a couple of symptoms and NEVER the real problem. I do not teach online or offer "dangerous" advice to people that are not standing next to me.
The reasons for this are many, mostly that the student does not have the experience to identify the root sickness and therefore doctors around the symptoms. Even if I explain exactly what to do, I have no way of telling if the message really gets through. Progress is measured in months and years, not hours and days. Habits are built on thousands of repetitions (assuming it is being done right). Bad habits result from not knowing what you are really seeing or hearing.
There are many things that will never be "virtual".