I've purchased a handful of things that I have scoured the internet for hours and couldn't find because they later came up in an ad randomly. I am extremely satisfied with the products. In fact, the only thing I'm not satisfied about is how much time I've spent fruitlessly which shows search is still an unsolved problem.
That something has some positive utility does not justify all negative consequences.
For instance installing publicly accessible cameras in all rooms in all homes would help reduce domestic abuse, however that obviously does not mean it's a net social good. In the same vein helpful target ads do not make up for all of the other shenanigans in manipulating people politically.
You sound like a perfect candidate for Facebook's new and revolutionary suppository microphone, which analyzes your outputs to more effectively target your interests. Think of the time you would save!
