I think you've found a legitimate use for this. (As a stopgap measure, for better education.)

Sadly, I don't think that will be the majority of the use.

Also, if this were the target use case, the use case could be adapted to the larger problem of tutoring/coaching feedback, to help the person learn and improve, not "write my essay for me, I don't much care what it says, just make me look smart".