I would love to see such an analysis, hehe :))
I have to admit that the exact definition of the problem is not easy to define:
e.g. if I have on my screen a video about "people-that-hate-bananas", would it be ok to have recommendations that show only e.g. "why-bananas-are-bad" or should I (ethically) get as well videos of the type "are-bananas-really-bad?" respectively "these-are-good-bananas!"?
Using the above example I guess that if Youtube (& similar sites) show only recommendations based on case #1 (which is eaaasy for IT) then yes here I go down the rabbit hole (reinforces/confirms the concept "bananas-are-bad") even if the recommendations are not worse than the original one => therefore even recommendations on "equal" level might have to be evaluated at least partially negatively? (as in this example the recommendations don't promote alternative point-of-views / alternative thinking / search for a flow or compromise, if you understand what I mean)
In any case the evaluation of the results you get might be very hard to do, if you want to do it automatically to understand the meaning (e.g. very hard to understand if "good-bananas-are-bad" is negative or positive towards bananas)... :P (maybe if you manage to you might become a Nobel candidate, hehe, or maybe I'm underestimating the current power of AI, which is definitely possible)