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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.
They get some control but it depends on the content how exactly it works. I think for normal videos they get a say right from the start where the breaks are. But I know one guy who does YT and he live streams and has to clean up every VOD because they just randomly pepper ads all throughout.