
Back during the early days when I was just starting out.
The first company that I worked for announced that they had just purchased a plagiarism software for their company to help writers avoid plagiarism pitfalls.
They had actual plagiarism report generators that were emailed to writers prior to client submission so that the writer could correct the "plagiarized" content of the essay. The problem with that system was that it cited all properly referenced quotes in the essay as plagiarized, along with the words "I, the, an. am, that, he, she" and a host of other words without which an essay can never be written.
When we complained about it, the company said their software was "flawless" and "faultless". We asked them to try writing an essay without verbs, connecting words, nouns, conjunctions, etc. They eventually stopped using that software because the writers refused to work.
They made it impossible for us to do so because of their software. As time progressed and I started moving across companies, I still found evidence of plagiarism detection software use by the companies. It always did them worse than good but these idiot scam companies place their unwavering faith in the flawed and stupid system.
So yes, I can confirm these programs exist. At least, based upon the plagiarism reports I received until my last day of active writing at my previous outsourcing company contact.