YouTube: Show them this ad.
Browser: Sure. OK they watched it.
YouTube: Really? That was too fast. It was a three minute ad!
Browser: Oh, right. Well they’ve definitely watched it now.
YouTube: You sure?
Browser: Totally.
Something that youtube can do is open the ad on a background tab, muted and with width and lenght as minimum as possible. People don't want to see that shit, but want the ad revenue, so I guess it's a win/win situation?