I think it's the advertisers that assess user profiles and bid on who they want to show the ads to. YouTube would only be responsible for choosing from the coll

I think it's the advertisers that assess user profiles and bid on who they want to show the ads to. YouTube would only be responsible for choosing from the collection of advertisers that select you. YouTube would want to maximize the bid price as well as the likelihood of success so that the advertisers will continue to get value from their ad-spend, right? If you don't have many advertisers choosing profiles like yours, YouTube's algorithm won't play much of a role in selecting what ads you see. Please correct me if I'm wrong.