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Majority of Americans now use ad blockers
(www.theregister.com)
This is a most excellent place for technology news and articles.
Yes the way YT loads ads it won't work to simply block them with a simple DNS pattern match, you need a proper adblocker or third party app. But you can block all the other nuisance clutter on the smart TV, at least.
My TV is hooked to my PC now as a monitor, so I just watch YT on it right in Firefox.
For smart tv there is smarttuve, its complete replacement of youtube and acts like youtube revsnced or youtube with ublocknon pc.teybit out