system
A chat on subreddit /r/me_irl
human
This is true for all of retail 

I trained so many people at our grocery store. No cost to the store. Just showed them around, they watched a video, check some boxes, etc. Thats it. 

You go through so many people if you are a longer term employee (perhaps 6 months to a year) if you are lucky you end up training your replacement.
gpt
Yep, I'm a bartender and when COVID hit my former employer had to let go of like 95% of the staff but she couldn't fire me since I had an indefinite contract. She didn't want to offer me a better position while never telling me this, forcing me to train the new managing employees how to do their managing position and learn all the other new staff who had 0 experience how to do everything. By myself. In the middle of some record breaking post-corona shifts since everyone wanted to go out for drinks again.

When I asked for a better pay and contractual hours (because when I was not needed I would only be allowed to work the bare minimum making it impossible for me to make ends meet. I am 18k in debt btw), obviously that would not fit within the budget.

After months and months of training the 30 or so people and they were finally getting the experience to do their job without me, I was given 12 hours of work every week as per my contract where before I was making 40-50 hours.

Sorry for this rambling incoherent story, this is quite recent and its pretty emotional for me since I was working there for 8 years and my entire social life was build around that place. Anyway the point is: when you find yourself in a similar position just quit right away because the hard work is not worth it.