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YouTube is now hiding the skip button on mobile too
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
No it's not, it hides the skip countdown, once skipping is an option, the button is there. The scrubber shows the length of the unskippable portion of the ad instead of the length of the full ad, so it's a different kind of deception, but the button is still there when it's usable.