No one's who's done business selling to consumers is cheering about this. What exactly is gained for the society when a business has to show bike ads to basketball enthusiasts?
I am open to hearing how exactly targeted advertising has damaged our society but I will not accept vague notions of spying and privacy as an argument.
Most of the entities powerful enough to spy on you currently, will continue to do so discretely.
My opinion (and that seems to be that of many) is that targeted advertising is not desirable. Neither from a user perspective (I don't want to give my data to a FANG company) nor from a society perspective.
It opens up the flood gates for misuse like the CA case and it doesn't make the world a better place. And it's not only that isolated case, it's FB's own behavior - things like scraping and cross referencing Bluetooth network and contact information. It's a recipe for disaster.
Find a better business model.
I see you haven't researched the topic in question and have stated you are not going "to waste time". This actually succinctly summarizes most of the knee-jerk reactions.
Also, this may be hard to believe, but, most people don’t like ads and don’t value “useful ads” over their personal privacy.