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YouTube is Losing The War Against Adblockers
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
I'd argue they risk losing users who post links to their videos online. It's likely the same group who tend to use ad blockers are also the ones more likely to link a video online, so YouTube would miss out on all the non-adblock users clicking links and watching the videos that way.