For me it was ads from a shady guy that was telling me that schools are how the "elites" make sure the masses don’t now the truth. Then he explained how his online reeducation courses would open a new world to me (and get rich).
I reported it and YT said the ad wasn’t violating any TOS. Meanwhile I was getting this exact ad like 20% of the time.
When corporations are complicit with the spread of conspiracy theories, we’re headed for a dystopian and fascist future.