Essentially websites such as YouTube remain free because, in exchange for allowing you to watch videos, you spend a small amount of your time watching adverts.
If you use AdBlocker then essentially you are using the service without paying for it (paying with your time). You are stealing.
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Cry me a river pls. Well actually don't, England is already flooded enough. I put up with Banner ads, I put up with pop-ups (Even the obscene ones) simply because they were rare. Then when Youtube added that stupid irritating bar I put up with it, 2 Minute Unskippables? Now you are pushing it. Hiding f-cking go compare and cilit bang adverts in the recommended video feed that trigger midway through what I'm watching? Get bent. Then making those GoogleAds things link to virus sites? Ok, you can -blam!- off. I'm done with this shit. -Adblock installed- Ah, now isn't this a lot nicer :D Am I stealing? Lol, yes It's daylight robbery that I don't get viagra and 4x4 adverts raeping my computer monitor 24/7. Will I repent for my evil ways? Nope. If advertising companies stop acting like shitheads? (See - never) I'll think about it.