Blame it on Facebook and Google. All they care about is money and not the safety of the users. Why they don't moderate scams, malware, phishing links that use their platforms to advertise like the way they would moderate explicit content or "hate speech" is beyond my understanding.
Such ads shouldn't appear anywhere on social media, if only they were not greedy companies.
You are correct that Facebook and Google do not care about their users, but do you think users should be educated enough to know how to defend themselves? Social media is for everyone, and identifying scammers will be difficult. Scammers use another person's identity to get people's attention and scam them, and it will be difficult to know if it is the real person or not. The only way to avoid falling into the trap of the scammers is to be careful and smart about what you are doing. We should not allow greed to lead us into the trap of scammers. I know fraudsters are highly cunning, but if we are content with what we have and not searching for a quick profit, we will be less likely to fall victim to their schemes.