i have successfully blocked YouTube by adding the following urls to the blocked list.
only issue is that if you allow for a short time by turning off parental controls it obviously removes all other safeguards.
it would be a great feature if you could turn off blocked sites only temporarily.
Hi. you have to use several addresses to block across app etc.
There maybe more since I last updated the list, because google own youtube now theye push out under various address.
Good luck as I know your pain.