Marketing is just an attempt at persuasion. It's the most fundamental form of communication. It's intrinsic to being human and interacting with other humans, and drives the reproduction function for basically all living things.
You have, in fact, just engaged in it in your comment by offering an opinion in hopes that others will read and adopt that opinion. In fact, you posted your comment on the marketing website of a well known private equity firm.
The difference being that this site is built for this kind of exchange, and parent poster is engaging exactly in the way it is designed for.
A lot of outrage in marketing comes when it stands in the way of your product experience. Think TV ads that interrupt. Or fake ratings that abuse a platform.
it's true. persuasion is the immoral core of marketing. personally i believe everyone should hate persuasion too but nobody will listen to me when i try to compel them!
Marketing is very often a dishonest attempt at persuasion. That's the whole issue. In the kindle example, the marketers aren't trying to persuade you to buy books by extolling their virtues, they're "gaming the system" to give themselves a leg up in ways that make the system worse and borderline unusable for good-faith actors.
Modern marketing frequently "rides the line" of what's legal and has little to no concern for ethics. Teach kids how to annoy their parents so they buy your toys? Sure![1] Prey on teenage girls' insecurities to sell them cosmetics? Of course![2] Lie to folks that they're going to "win big" with your gambling app? Why the hell not!
[1] https://en.wikipedia.org/wiki/Pester_power
[2] https://en.wikipedia.org/wiki/Effects_of_advertising_on_teen...
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By that definition, any form of philosophy or politics are subcategories of marketing. It's not marketing if they're not trying to sell you something for money.
To address your point - the flowery and innocent core promise of the field may have been true when it was first invented thousands of years ago. Exposing people who actually want to learn about goods and services to your offering in an attempt to establish a mutually productive relationship (they get something they want, you get money) is fine. But that stops short at about the 0.01% mark on the way to the beast that marketing became today. Modern marketing is about pure value extraction at any cost. Modern research and tech has enabled them to find loopholes in every relevant regulation, flood every empty crack of the internet with garbage if it means they get an extra cent out of it, study the flaws of the human mind to discover the best ways to abuse it into buying their thing, plaster every object in existence with screaming ads and audiovisual trash to force people to internalize their message. There is no natural cap on marketing, so we've long since moved past unobtrusive, good-natured promotion into full-blown insanity.