Blocking YOUTUBE on all devices, Smart TV's, smart phones and internet

Nowadays youtube is on everything even on TV's so you block the kids devices, they just go to the TV and watch the same junk. There is a list of like 10 websites floating around to block youtube but I have found them to be useless.

You can block youtube everywhere by adding these 3 sites to block list

youtube.com

googlevideo.com

gvt1.com

this essentially blocks youtube on everything and you are done. If you as the parent want to watch youtube, a VPN app on the main TV or changing DNS on that device will be useful so you can monitor what kids watch.