Employers *should* expect to train (and continually train) their employees. In addition, people leave jobs for various reasons — employers understand this and design for better retention. I don’t feel any remorse on either of these fronts.
Based on your definition, that could be any field. You could work in finance, but in facilities maintenance, for instance. It may also help to know that nearly 70% of Americans have less than $1000 in savings. I also urge you to review the section in this article that focuses on precarious jobs.