[chii]

So what is the exact impact? I keep hearing claims that advertising is bad, but never an actual example of an impact - something concrete.

Ads to me are merely a nuisance, and annoys me, rather than impact me in any dangerous way. Of course, i will do my utmost to remove it from my life, but i cannot see it be called a danger to the public. Calling it such will actually diminish the importance of other public dangers, such as lobbying, monopolistic corporations etc.

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You mean public harm other than tracking you across the entire web, profiling your personality, adservers getting hacked and serving malware, taking up cpu cycles and memory, stealing your attention which are experiences which are life?