Perhaps this is nonsense and anecdotal but what's concerning for me is not that they're simply wrong and are showing me irrelevant material, but it's that they can become a feedback loop of dissonance and can be reflection of a shift in viewing habits or pollution by what YouTube thinks is a similar demographic to you, but are quite different. When these recommendations are combined with a pseudo-trusted body (in most people's mind) that can be manipulated, it becomes quite a fruitful environment for propaganda.