Brand safety

Advertisers set what they will run alongside and platforms translate that into suitability ratings. On YouTube it shows up as the yellow icon and limited ads on videos touching violence, sensitive events, adult themes or heavy profanity. Self-certification is where you declare the content yourself, and answering it honestly keeps new uploads out of manual review.

Worth separating from discovery. Suitability and recommendations are handled by different systems, so limited ads describes how a video is sold to advertisers rather than how widely YouTube will show it.