Let’s be honest here: they want a human to abuse. They want to be shitty to and verbally assault someone that they view as being “lower” than them. If the AI works well (a different conversation) then people will get over any trepidation they have rather quickly. The people that are legitimately upset will just miss having someone to put down for “only” working customer service.
It is much easier to buy one “hefty” physical machine and run ProxMox with virtual machines for servers than it is to run multiple Raspberry Pis. After living that life for years, I’m a ProxMox shill now. Backups are important (read the other comments), and ProxMox makes backup/restore easy. Because eventually you will fuck a server up beyond repair, you will lose data, and you will feel terrible about it. Learn from my mistakes.