The last example is actually the most interesting! The essays are whatever, dumb or lazy kids are gonna cheat on their homework, schools have long needed better ways of teaching kids than regurgitative essays, but in the mean time just use an in-class essay or exam. But people aren't really making the brain-dead books and videos as anything other than a curiosity, despite the fears of various humanities professors.
The interesting part of AI, and I suspect the primary actual use case, is everything else.
In my camping car, somewhere in the desert, I sometimes have limited resources. Like a can of beans, some fresh potatoes, an apple, Italian spices, and so on.
I like to ask ChatGPT: Listen, I have this stuff, I want to create some food with strong umami taste, do you have an idea?
It is very good at that, the results were often amazing.
This is its core feature: 'feel' loose connections between concepts. Italian pasta with maple syrup? Yes, but only if you add some Arabic spices...
"AI" is, due to the nature of artificial neuronal networks, not intelligent. It does not learn intelligence, it does learn feelings. Not emotions, but feelings in the sense of unconscious learning ('I get a feeling how to ride the bicycle off-road ').