I'm specially refering to YouTube here. Take for example the "cell biology" subject. In a few videos ahead you'll start getting non-scientific videos, as "recommendations".
Suffices to say that those videos speak about widely discredited life theories but with nicer stories.
These recommendations exploit the human brain in ways that even the creators can not comprehend.
We could, for example, use these technologies to teach children to solve equations. Use ML to find the optimal, user specific, series of teaching material that takes a child from zero to "can solve any equation involving +,-,* or /". But no, "we don't have the resources". Ah! want to go from cell biology to cute animations of pidgeons? Yes, we have de optimal path to get you there for free on YouTube.