So, here it is... The problem I've been battling with for about 2+ weeks now with no actual answer from @TeamYouTube. It's super complex, and honestly if left unchecked, can cause major damage.
Please help me spread the word so it can get fixed.https://www.youtube.com/watch?v=a4u-jD4HGCk …
That reminds me of this nonsense from a few years ago. Didn't seem to be an attack, in that case, but the notes talk about a full music video playing as an ad. https://bat-lass.tumblr.com/post/119098411277/so-im-watching-youtube-and-the-skippable-ad … I wonder if this was some kind of dry run for figuring out how to use random videos as ads...