Earlier quoted context omitted.
In many courses, the grades are curved, so cheaters might really make the grades of honest students worse. While I am against these surveillance software, making sure that tests are fair is very hard, especially since everything is online now thanks to COVID.
Not in my experience. I don't think there are enough cheaters to shift the curve (the noise from year to year is much more significant), and despite what you'd expect, the people hired to do others' assessments aren't necessarily very good at it!
A sibling program at the university exposed a cheating ring of ~15-20 people, and I think many were surprised that the result was to simply zero their grades for that class instead of more severe action.
/e I mention incidents and sizes since these programs are not thousands of students but tens or hundreds.