As someone who has worked for Google Ads, I should say that they do review ads with both AI and humans, and do spend quite a bit of money and energy on finding and stopping both bad-faith advertisers ("buy side", what we see) and bad-faith publishers ("sell side", more of a scam on the advertisers/google itself).

Is it enough? Probably not, based on this article. Are their policies strict enough? IMHO no way, considering Youtube left an ad up for "Ukranian women" in the early years of the war which wtf. But they certainly do try.

Like most businesses, the actual people involved are also well-intentioned, at least in the abstract; they wanted to make ads that sell products without annoying people. Obviously there's material conditions beneath and around all that, but we don't need to explain that part here ;)