The four categories of risk
Content risk: topics, opinions, or on-screen behaviour that would embarrass a mainstream brand if a screenshot went viral. This is the obvious one — and the one legacy tools handle worst, because keyword-only detection misses context.
Competitor risk: a creator running a paid integration with your direct competitor two months ago is a real problem, even if the content itself is squeaky clean.
Voice risk: a creator whose tone reads sarcastic or cynical won't sell an earnest 'we care about the planet' campaign, no matter how polished the deliverable. This isn't a safety issue in the legal sense — but it's the safety issue that quietly kills more campaigns than any of the above.
History risk: everything the creator posted between now and their first video. The older the content, the harder for a manual reviewer to catch.