Bing makes it clear when a site is promoted by prepending "ad" to the search result. Other search engines such as DuckDuckGo and Google do the same. It is near impossible for Bing to manually review every advert so perhaps it would be beneficial for search engines to provide a way for users to report rouge promoted links, similar to how YouTube allows you to report its sidebar ads.
I don't agree with this. Reviewing ads should be a straight forward process, much more so than reviewing an app submission. Plus, obvious issues can easily be automated, reducing the load of manual reviews.