I've used the detectors as well. At my university, accusing a student of cheating is a big deal and you want to go into it with as much documentation as you can muster. Even though I know it is AI, I'm going to be showing it to administrators without my area of expertise and experience. Administrators like reports and numbers, so I run whatever the assignment is through a checker, let it generate a score over 90%, and now I've got a number inside of my paperwork that will encourage my supervisor, or more often my supe's supe, to take my accusation seriously. Before these AI checkers, I used "turn it in", and before that I had LCS tools and diff command.