Half-joking with this one.
I'm not a huge YouTube watcher, I don't have premium so I get the ads. However, I'll always pop a YouTube video on whilst I'm cooking, normally George Memeulous because he always uploads bang on dinner time.
I've noticed that, whilst cooking, YouTube will tend to show me ads when my hands are busy. For example, when I'm mixing stuff with my hands, when I'm in the middle of washing up or when I'm handling a hot tray.
I thought it was a funny coincidence at first, but now I'm not too sure. It's near enough every time I cook now, YouTube won't play an ad until my hands are busy and I can't hit the skip button. I'm convinced they can access my phone's camera and the algorithm/AI/whatever has learned when I'm in a position where I can't skip an ad.