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how could have they slipped the AdWords ad approval team?
What approval team? If there is such a thing, I assume that a human reviews ads only if they are flagged by an algorithm. I assume a tiny percentage of ads receive human review, otherwise, G would need a massive army of reviewers.
What approval team?
All ads must comply with our advertising policies. While some ads may run on Google prior to review, others may not run at all before being reviewed and approved by an AdWords Specialist. If your ad is awaiting review, we'll get to it as soon as we can. While your ad is in queue, you can review our advertising guidelines to ensure that your ad complies. Also, note that no ads will show on the Google Network until after being reviewed and approved.
Very bad & very unfortunate as it completely destroys the credibility of the adSense program.