I look upon this idea skeptically. In my experience, the content delivered to me is as divisive as the videos I've already watched. If someone is getting divisive content, that's probably the content that they want to watch. Is it really up to YouTube to determine if a person has been watching content that's too divisive, like a bartender who cuts off a someone who's had too many drinks?
When I log out of my YouTube account or open YouTube in incognito mode, all I see are viral videos and nothing that's "divisive". For example, the YouTube homepage without being logged in shows prank videos, Rube Goldberg type fascination videos, educational videos, Mexican music, daytime TV crap, SNL skits, and pop music.
So basically, in order to get to the divisive stuff, you have to already be using search queries that will bring one to political commentators.
But then what should be done? If someone is watching a lot of videos by the far left, should the recommended videos proportionally include more videos by right wing commentators? Is this really what people want?
Sorry that this is tangental from the actual point of the article, but I've read of this idea multiple times before and it's always asserted as if it's a matter of fact, but I'm not sure I buy it.