I never quite understood the appeal of giving some unknown third-party the right to put links and text and javascript onto your site. It might be labour intensive to have human eyes on every ad that is sold when you're at Google, or even Bing, scale. But it seems a little bit too hands-off, and irresponsible, to take money without vetting the input and then letting every scammer get into that very "blessed" and visib…
Your recommended children’s videos are actually disturbing parodies? Easily solved with human curation. Some Alex Jones story makes its way into your news aggregator? Having people check the story would fix this. Scammy or malware-ridden ads on your site? See above.
Obviously this isn’t practical for everything, but tech companies take it way beyond what’s necessary, then act like the problems are impossible to avoid.