In Serrano's class and other introductory classes like it, cheating has been widespread before AI and after. The truth is that the social stigma around cheating has gone away (perhaps this is only a post-remote-schooling phenomena) so cheating is trivial. All you have to do is go text a friend in the class (most people will have many friends in any large intro class they're taking).

Source: am student @ Brown

I think this is an important point.

A time when a take-home, closed-book test, relying on the honesty and integrity of the students, was viable seems completely unrealistic now. I assume there were always some who cheated, but I can imagine that it was sufficiently socially unacceptable that many didn't.

That seems like a very different world.