> I realized that my students are so afraid of cheating that they mostly don’t collaborate before their exams! At least not as much as what we were doing.

This is radically different from the world that's been described to me. Even 20 years ago cheating was endemic and I've only heard of it getting worse.

I teach at MSc level, and over the last couple of years about 15% of my students have cheated. Really obviously cheated, like two students submitting 100% byte-identical answers.

But this class is not very representative of what the same students are presumably doing for other classes.