Those parade of horribles raise an awkward question - couldn't the lack of targetting of advertising make it even worse in several senses? We had the "punch the monkey/click here for viruses" in the past instead to monetize general targets when it was more niche. People forget /why/ Google won web advertising like they did.

The "badness" of the ads results from the selecting function and what becomes sustainable and favored. Infamously with spam and phone calls it can include outright crime.