> More than 300 U.S. firms inadvertently hired impostors with ties to North Korea for IT work
"Impostors" implies that the people they hired couldn't do the job. That's not true: These were people who just faked their location/identity. They had the skills and worked for a long time for those companies. As far as the company was concerned, they were just regular employees. If they couldn't do the job they would've been fired.
If these "impostor" employees actually couldn't do the job and they somehow were able to stick around for as long as they did there's a different sort of crisis going on in "US companies" that has to do with management.