Pretty much all of my YouTube ads are for TV shows, movies, cars, mobile games, consumer products, and various consumer services. Volkswagen, Dove, TurboTax, etc. All incredibly mainstream.
Maybe you're located in a country or region maintain advertisers avoid?
I work in mental health and I am seeing more people who spend a substantial amount on “parlays”. Many examples downplay or hide the behavior from their social network and the extreme examples spend a significant amount. The advertising is obviously predatory and goes against what we know about control dynamics in addict behavior but we tend to view that as a personal moral failing rather than exploiting basic biology and as a result allow the dealer to ruin countless lives before any action is taken (see Purdue and Teva lawsuits)