I have plenty of experience doing code reviews and to do a good job is pretty hard and thankless work. If I had to do that all day every day I'd be very unhappy.
It is definitely thankless work, at least at my company.
It’d be even more thankless if instead of writing good feedback that somebody can learn from (or can spark interesting conversations that I can learn from), you would just said “nope GPT it’s not secure enough” and regenerate the whole PR, then read all the way through it again. Absolute tedium nightmare