This is actually a very bad aspect of Facebook, they approve the advertisements of fake, phishing websites for money. Even Facebook sometimes approves of their own project libra's fake website ads!
One of the easiest means someone can be gotten scammed is to make use of what people do make use of very well and often, like YouTube, Facebook, and Google, the reason why these platforms are the places to scam is because ads are often placed on the sites, they do not go extra mile to know if the company or person advertising is a scammer or not, they only just want money, that is why we need to be very careful of these online places, they are the easiest ways someone can see fake ads from scammers and be scammed and nothing will be done as compensation, the person will only just lose.