This is hugely important as a lot of people see programming as a ticket into higher-end jobs and will spend as little time as individual contributors as they can. The idea that "oh, they'll get caught in the workforce" is not correct - quite often the plan in the mind of these folks is that they will try to fake their way through and be moved up into project management, technical marketing, etc. and never have their lack of these specific skills exposed again.

In my experience these people are very dangerous, as their motivation to avoid being forced to try to do the thing they were actually hired to do is very strong. So they will have a mindbogglingly strong motivation towards office politics, manipulation of grievance mechanisms, etc. relative to someone who is 'distracted' by the prospect of, I dunno, doing the work that they are meant to do.

I worked at a tutor at the University of Sydney in 1993, where a group of 7 students hired a professional programmer to sit the 'gatekeeper' practical exam. These exams could be retaken but you could not enter 2nd year CS without passing them regardless of your marks. They were caught (via handwriting analysis on the worksheets where you were required to show your notes, among other things!) and in some cases fought the university in court for years over this.