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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.
I've read that YT is injecting the ads directly into the video stream, i.e. the source is not ads.someshittycompany.com, but rather videos.google.com (which you cannot block for obvious reasons). The only solution to kill ads is to use addons like uBlock or client software like Freetube, Newpipe and the like that strip out the ads in some other way.
I don't know if they actually started injecting it into the video, but even before they did that, they were serving the ads from the same domain.