The development from human workers to robots mimics what happened in delivery of messages. When I was a kid, people would deliver telegraphs to your door - for a substantial markup. These days, e-mails get delivered to your inbox without any human in the loop, and for free.
the fact that nobody is volunteering to become a slave doesn't mean there is a labor shortage
when we invented aqueducts who cared about the water delivery workers?
those are terrible jobs and they should be automated/replaced
https://historydaily.org/night-soil-men
While I was doing a degree I held two types of jobs over time. One was a shop worker, one was delivering food (pizza one summer, chinese the next)
The delivery job was far better than the shop job (I quit the shop job after 2 evenings)