I think it wouldn’t be that dificult to figure out what is interesting for people watching the video since channels themselves already usually have a target audience. If I am watching a video from a dude who focus on video games or tech odds are I’d be more interested in tech adds. But if Google REALLY wants to know what we need/want then yeah maybe you’re right. Shit it happened so many times me just saying the word pizza would set off a pizza ad later in my phone. These mfers want to inject ads in our souls.