This is insane. Most people never attend university and do plenty of productive work. Most people who do attend university never work a day in the field they did their degree in. Most people who do work in the field they did their degree in never use the large majority of what they leaned there. On top of this a large majority of professionally relevant material is learned on the job.
The reason that there’s no real effort to check people aren’t cheating is because school isn’t primarily about learning, it’s about ranking and sorting.