You cannot steal something like youtube. Stealing would imply that you were taking it from somebody. Nobody loses anything when you pirate a movie. Nobody loses anything when you block ads. Taking a picture of the mona lisa doesnt take the mona lisa from anybody. Reading a free newspaper and not looking at the ads isnt stealing the newspaper. Listening to the radio and switching stations when ads come on isnt stealing the music. Watching TV and switching stations when ads come on isnt stealing the TV show.

You seem like you might be part of the population who are the kinds of people to get outraged when people fake drinking their verification cans.