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YouTube adds new hurdles for ad blockers, and there's currently no way around it
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
If, when the ad read starts, you double-tap to fast forward, a little skip button will pop up which allows you to skip the sponsored section.
With a browser addon you can skip automatically without Premium. It doesn't work with very fresh videos though, because they need time for the timestamps to get added into the database.