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.