I'm pretty sure this is true. However, there is one more effective around this. You have to go back and delete your history. I have one youtube identity I maintain for exactly one interest (call "interest X"). I have to essentially scrub everything not related to that from it's history or more and more unrelated crap will appear reliably. Basically, even watch 10% of something means recommendations jump up to 50% of other things even though I have a looooong history of just being interested in interest X.
Recommendation algorithms don't "conclude" anything though, they are merely statistical tools to ensure you get somewhat relevant content, but they are never perfect because there is a lot of noise in what everyone watches.
A. Jeesh, there's no problem with informal anthropomorophizing in this situations. When humans have a goal and feedback towards reaching a goal. When a human gets positive feedback that X gets them towards the goal, human choose X. The combined system Google-corp+developer+algorithm is also goal seeking and making choices so anthropomorphizing the system is appropriate.
B. The problem we're talking about isn't "noise" but "feedback" - a goal-seeking-system that muddies it's final result with it's initial state. Essentially, bias, a situation that's quite common in statical systems.
And youtube rules also motivate providers to churn out a lot of content regularly (leading to quick to produce crap) and punish those who take their time to think or research before they talk.
The problem is probably 1% or less of users ever click it.
They would be much less horrible if every time one watched videos, they would rate them in a way, instead of assuming that "watching"="interest".
> And youtube rules also motivate providers to churn out a lot of content regularly (leading to quick to produce crap) and punish those who take their time to think or research before they talk.
That's not just Youtube: about all media is driven by what's "new" and "hyped" rather than what is deep and well thought about.
I am interested in scientist or writer etc youtube channel about her topic. Not so much in confident-Johnny-cranked-out crap on the same topic.
Given my understanding of how the recommendation engine works, if you watch a video slightly related to a topic, then another video slightly related to that topic, there is a reinforcing effect whereby the engine believes you to be more interested in that topic. E.g. if I watch a video on vegetarianism, then another one, it may strengthen the confidence that I am interested in vegetarianism, and conclude that they should be recommending me more content about vegetarianism and perhaps even content about veganism. Apply this to something like conservatism and you'll be getting recommended alt-right content in no time.
Slightly off topic:
I have a theory about this which is that there are certain recommendation loops or "attractors" that you basically cannot escape without manually flagging videos as "not interested", disliking, manually choosing an entirely different topic, or taking many days off of the platform.
I also am curious to know what percentage of content literally never gets recommended. I've been down the rabbit hole, so to speak, on certain youtube topics and I get the sense that at a certain point, there are many videos on the topic that youtube simply isn't recommending. E.g. if I'm watching a video about the Philosophy of Derrida, I feel like my recommendations never show lower view count videos related to the topic, they are much much more likely to recommend higher visibility channels full of slightly related content.