One must assume YT has a blacklist of search terms/topics that won't persist in recommendations(?) - at my place of work these types of blacklists are only poss

One must assume YT has a blacklist of search terms/topics that won't persist in recommendations(?) - at my place of work these types of blacklists are only possible to add to "when people ask" (unfortunately) or if they're basic/obvious (NSFW terms or "words you can't say on the radio"). The phrase "roadkill" specifically came up today in a somewhat similar context.