In this study, the research team defined problematic channels as those that shared videos promoting extremist ideas, such as white nationalism, the alt-right, QAnon and other conspiracy theories. More than 36% of all sock puppet users in the experiment received video recommendations from problematic channels. For centrist and left-leaning users, that number was 32%. For the most right-leaning accounts, that number was 40%.

They defined problematic channels as anything specifically espousing far-right wing ideas, and found that ring-wing users were only-slightly more likely to be recommended content from them.

It's kind of disappointing they couldn't find something problematic or conspiratorial from the left, even just for the sake of comparison.