I am unemployed for 6 months now, and I watch YouTube from time to time, and search for all kinds of things. From a human viewer perspective, the ads were more related to my YouTube watching behaviour than my browsing history. I use DuckDuckGo but let Google Analytics see me.
Recently I decide to start doing video essays. I searched for a ton of medieval history stuff and watched a ton of related clips. I notice that YouTube began to show ads of at least 2 "I get rich from millions in debt" self-help workshops/courses to me, which I've never shown any interest in.
I have watched audio equipment review videos as well, and that's the only possible connection I can establish between the ads and my online behaviour. Are a lot of unemployed people seeking to enter audio/video making? Or are the snake oil ads showing on many people's screens because of the dire economic situation many of us are in?