I hired an editor (not on Upwork) who had worked for a number of very famous authors (people you've heard of, people who've sold millions of copies). They did a fantastic sample edit, and the quality of the work dropped off precipitously by about the 20% point of the manuscript. The best-case scenario is that they just didn't care, because I'm a nobody and because of the novel's length--over 250K words, so self-publishing is the only option. However, there's a lot of forensic evidence suggesting that they farmed the edit out to more than one person (which would explain the inconsistent apparent level of skill and care). So I started looking into this, and apparently this is a common practice. Being traditionally published won't necessarily help you; the big houses contract out most of their editing work, and the same thing can happen.
Software might have the opposite problem from fiction editing, though. With editing, the issue is that the money (at all stages) is so poor--the average novel only sells a couple thousand copies--that I imagine a lot of people feel they have to do this sort of thing to survive. In software, these problems tend to involve there being far too much money at stake.