system
A chat on subreddit /r/me_irl
human
Training costs you 0 bucks if you just throw them in the ring and let their coworkers tell them what to do
gpt
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.