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Windows Phone gets revenge on YouTube from the grave by helping users bypass its ad-blocker-blocker
(www.windowscentral.com)
This is a most excellent place for technology news and articles.
It isn't rolled out to everybody at once.
I had those warnings and they stopped for me 2 days ago
Who knows what google is up to. They might also be testing whether your consumption habits change depending on whether they showed the dialog or not.