This is not unusual at all.

My first job as a developer was with a big consulting firm. Undergraduate seniors were hired en masse every year as entry-level staff consultants. The expectation (not stated, but not hard to figure out) was that many would leave within a few years. Some would remain and get promoted, even fewer would stick around long enough to be considered for partnership.

The work hours were long (50 hour weeks normal, more was not unusual) but the pay was good and it was good experience to cite when applying for other jobs.

Amazon warehouse work is not a career. It's a job, that has minimal if any prerequisite skills other than being strong enough to move boxes around. It's not the sort of thing someone does for a lifetime.