system
A chat on subreddit /r/wallstreetbets
human
I personally know several people (mostly STEM majors) in college that pay for it and will do so all 4 years.  Also buy all their textbooks through it. They are rapidly expanding with extremely high profit margins and just had a 13% dip that I'd argue wasnt called for from that hack (no financial data was stolen and it happened back in april)

gpt
Oh I also use them for books, especially renting, but I enuinely was just wrong on their subscription service then. I didn't know people bought that. I think they have a good idea and are a big name in a growing market (buying/renting cheaper textbooks) but in recent years I've seen a lot of universities like mine willing to match the Chegg rental or even just have the textbooks cheaper on hand for rent or purchase.