They get shown ads that might be more relevant to them than just an ad picked at random, which might make them more likely to buy the product displayed in the ad. I guess that could lead to some extra harm to their wallets, but otherwise I am with you on this one.
The information necessary to do that is stored, could be used for other things in the future by that company, could be stolen, could be subpoena'd. It's also taken without explicit consent or explanation of what is recorded.
Bullets are just pieces of metal and gunpowder, why are you afraid of them?
Note that they also don't just sell "ads", they sell psychological manipulation. Yes, product ad targeting is one type of manipulation but where the real danger lies is when they target us with ideology. It's an expressely evil system.
Where does ideology stop? In some sense all the ads blend into one meta-ad, an implicit one, that teaches us what to value in life. I mean something of the same nature which used to be the "picket fence suburb house, 2 kids and a dog", but is something else today.
Slavoj Zizek (controversial I know) has good observations about this, that ideology is precisely the whole framing, which is invisible from the inside. You don't notice it as something "sold to you", it's deeper than that, it's something that informs what you should strive for.
Ideas like "if only you could afford XYZ, things would become so much more $positive_adjective". But not explicitly. Through implication, stories, association. That you need to work more, build a career, buy better things, or become free, express your inner authentic self through self-expression using this and that brand, this and that political slogan etc.
I anticipate that this is already too much of a cliche for some people, while for others it's just a strange way to look at things...
Why do people think ads only have to deal with buying stuff like your next take out meal or a book on Amazon? We have ads for politics, charities, public service, pubic image of famous people, etc. We have ads for basically everything. We've been doing this for over 100 years too! I'm pretty sure if ads only helped sell more hamburgers then politicians would spend their campaign money elsewhere. Surely someone in the last hundred years would have figured out a better way to optimize that cash flow. But just simplifying the argument to selling more hamburgers is pretty disingenuous.
The previous poster made a typical response. The argument goes: "Ads are just how people learn about new products! If you have a local business, you can make a nice sign above your office/store, or the modern equivalent which is advertising on Facebook! Everyone benefits, we learn about new products, the market can function, people learn about alternatives and new competitors can efficiently enter the market and be noticed by consumers!"
Then in practice there are way more ads that sell you a worldview, adjust your desires in some small way that's small in one iteration but can transform your values over the years.
Also the problem isn't just the ads, but also the tools they use to keep you engaged with the ads and spend longer time on the platform. Their tactics follow the sparse rewards patterns that gambling also follows. They use lots of counter-intuitive patterns like intentionally throwing in irrelevant stuff, because it's how our brains are wired: we get hooked more if the interesting stuff only comes every once in a while, and otherwise it's boring. This gives the activity an overall unpredictable nature that makes our brains want to explore and understand and build a better model of this environment, to reduce this unpredictability. But if it's carefully designed and always in motion, shapeshifting in response to how the masses interact with it, it stays mysterious for our brain and we get hooked.
It's worrying how many otherwise smart people dismiss this saying "whatever, I don't buy luxury cars anyway, who cares if I saw some ads for them?" (and we could go into how the car companies can benefit from you seeing the ad even if you never buy the car yourself)
Marketing psychology and addiction psychology have developed a lot over the years and there is basically zero amount of this taught in normal schools. People just don't think in terms of these tactics. We are like some naive old trusting grandma in the eyes of the manipulators (who, by the way, aren't evil, they just want accomplishments, want to achieve metric targets, get good evaluations, get promoted, build their CV etc.).
some hn guidelines, in case you might find them helpful:
Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith.
Be kind. Don't be snarky. Have curious conversation; don't cross-examine. Please don't fulminate. Please don't sneer, including at the rest of the community.
Comments should get more thoughtful and substantive, not less, as a topic gets more divisive.