I assume parent was referring to... gets up and walks away, while youtube continues to autoplay
I feel like YouTube by now is more similar to TV advertising, you take in consideration that people could just have the tv on in the background while doing something else or going around the house. Unless you don't know what you are doing with your advertising budget of course.
Of course I run a malware blocker, I mean ad blocker, so I'm not seeing those ads served by malware networks.
With hindsight advertisers must be aware of fake likes and such too.