I believe it is some of the people that work there not all obviously, but it's mostly the system that's the problem. Ads nowadays are specifically designed to track you and harvest personal data about you at zero expense to you. They are often deceptive in that they advertise a product always as a cure all for everything and they use proven psychologically manipulative tactics to get you to buy the product instead of demonstrating what the product can do. Obviously, Facebook has skin in the game to keep this system going. Which is why they're doing a poor job of fact checking ads and would rather not do them at all.