Maybe nobody is interested in buying ads for the stuff you are interested in and conversely, the people making ads for the stuff you dislike have so much money

Maybe nobody is interested in buying ads for the stuff you are interested in and conversely, the people making ads for the stuff you dislike have so much money that it's worth it to them to invest in trying to make you buy their stuff despite your dislike. So in a sense, targeted ads are only worth it for the ad seller who can try to squeeze even higher prices from the ad buyer.