How are business enforcing these travel bans on their employees? How are any travel bans working?
I have a friend who lives and works in South Korea which is one of the top 3 corona hotpots right now. He recently learned that Japan would not allow him in for the vacation he had planned in a couple weeks. He had already been working remote for a couple weeks (not quarantined to home) so he figured he would just come home to the US (for hundreds of dollars cheaper than normal), work remote, spend his week vacation, and then either return to Korea or maybe stay a bit longer if they were still working remote.
He arrived this weekend and said that the Korean airport had workers in masks/suits, temperature screening, and things that visibly showed they were doing something to address it. His entry through US customs had absolutely nothing out of the ordinary.