Loving your job isn't mutually exclusive from being exploited. The best job I ever had was in a academic/research-tangential position out of school, but the pay was bad and the effort/reward required for advancement was unreasonable, so I left after a year.

yeah, they were being paid 3x the minimum wage, and were paid for prep time

vs. the alternative available part time work (sainsburys/tesco)

definitely exploited