We find no evidence that engagement with far-right content is caused by YouTube recommendations systematically, nor do we find clear evidence that anti-woke channels serve as a gateway to the far right. Rather, consumption of political content on YouTube appears to reflect individual preferences that extend across the web as a whole.
— “Examining the consumption of radical content on YouTube“
This is a large study but the conclusion surprises me. But maybe it isn’t the algorithm in and of itself that causes a radicalisation. Maybe it turns out to be more complicated.