It's true, they can't buy trust, but they can buy the way to reach the target audience you're looking for. They can buy that your ad is relevant, so it's a combination of the quality of your product to gain trust and boosting your advertising to reach more people in the niche you need.Paid Ads can't buy the trust that organic informative contents would buy you. Paid Ads would create instant awareness. But for you to gain trust of the market overtime, you need to build authority. And that is where content marketing edges it.