Good point of precision, I read their site too quickly. I don't think my argument materially changes with that number instead however. There were over 40,000 students enrolled in my university alone. Generously assuming they only turn in one assignment per year, having 4 of them go through the "computer says you cheated, and as you can see, it's 99.9% accurate" gauntlet is not a price we should be willing to pay for... the marginal benefit of this tool over more classical ways to proctor and assess pupils