As an educator, I found that the institution was often powerless to prevent or detect cheating, because many, many applicants are highly motivated by perverse incentives.

Many students attend because it's a "piece of paper" that's mandatory for their career aspirations. They'll never get hired without the college cred, and so they need to grab it by any means necessary. It's often not their own money they're spending: it's a federal grant, a loan, or mommy and daddy pining to give the same or better opportunity to the next generation. So family pressure to achieve is often immense, and overwhelming to a child being shoved through this system.

Other students, they already have a job and/or family, striving to get ahead and be upwardly mobile according to the American Dream, and so they simply don't have time for actual study or homework, but they paid tuition and purchased books, and these consumers need their product that they already invested in.

Perverse incentives abound in higher education, and without removing those or reforming the system, you'll never, ever stop or slow down the cheating, which is pervasive and rampant, believe you me.