What I never understood, when I still used FB, they knew everything about me and yet I have not once been presented by ads I was even mildly interested in while

What I never understood, when I still used FB, they knew everything about me and yet I have not once been presented by ads I was even mildly interested in while on Google it is always spot on... Not sure how they can be so bad to get 0 clicks from me while having all that info. It is like this person: getting car and mortgage ads while fb knows i could not care less about either. Getting rich quick packages, again I do not care about as far as they can see from comments etc. Flights to Thailand for next week while they know I am currently in Thailand. It is the worst targetting I have seen: not unlike the ads of the late 90s.