Because nearly every internet business gets it's revenue from advertising, a lot of good people jump through hoops to convince themselves that they have not made a deal with the devil. The downvotes[1] come fast when I point out this moral and cognitive dissonance, usually without any counter argument since they just want me to go away.
When I talk to anyone who's livelihood doesn't rely on advertising or marketing, there is near unanimous agreement that advertising is fundamentally manipulative and dishonest.
Besides the social cost of Advertising, there many other costs[2]. The idea that advertising gives us free web content and services is utter bullshit.
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[1] The cowardly downvotes with no counter argument have already started. Upton Sinclair is the actual source of the quote at the top. A wise man who got a bunch of downvotes in his time.