You're missing the GP's point. They're claiming that scam ads pollute the ad marketplace and drive away engagement. Why click on an ad, or even pay attention to

You're missing the GP's point. They're claiming that scam ads pollute the ad marketplace and drive away engagement. Why click on an ad, or even pay attention to it, if there's a good chance it's a scam? And why would advertisers pay for ads if consumers are not engaging with them? Thus, Google has an incentive to keep the ad space free of scams - it makes Google users more valuable to advertisers.