I watched the video as well and the takeaways for me are that algorithms on YouTube and other social media are increasingly promoting content that it thinks people would click on @JeffersonGrahamPhoto. Turns out that people click more on content that has eye catching thumbnail and a clickbaity / sensational headline.
The type of content such as education and science can’t compete in this algorithmic world without already having an established base of subscribers. The algorithm wouldn’t recommended those videos and instead suggest more extreme and overhyped ones.
Without human curation and judgement and left to its own devices, the algorithm would serve more and more extreme videos, because that is what people click on.