I don't think so, those banners are pure virtue signal. An attempt to look good to the market they've determined is the most profitable to align with.
If they were actually trying to change minds, they have so many better tools than an annoying banner that only makes you dig in harder on whatever you already believed.
Aren't they 'virtue signaling' by pushing a 'virtuous' agenda? These don't seem mutually exclusive to me.
Yeah, maybe I should have said "promoting" an agenda rather than pushing, for whatever difference it makes. Virtue signaling is the motivation, I agree. Nobody at YouTube knows anything about virology or vaccinations, nor do the vast majority of the celebrity creators of most of the videos they are promoting under that particular banner.