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YouTube's ad problem just got worse: Users now seeing 90-second unskippable ads!
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
AFAIK that is youtube delaying the video stream on purpose because you were supposed to watch ads in that time. If you wait 5-10 seconds it will start playing. For me it happens only on the first video, and autoplay is still instant afterwards. I am gladly waiting out the loading screen than watch ads. Knowing that I probably make google lose money on every view makes the wait even more bearable (I am never logged in, and anyways I always run youtube in private mode, so there's almost no profiling happening)