Bullshit!
I had an employer hire me away from a prior job. It was only 6 months after I had burned my bridge to previous employer by leaving them for more pay, that new employer mandated everyone sign their non-compete or be terminated that day.
At that point we were all trapped without any good options. There was no time to seek new employment or not lose health insurance for the family. The company car & phone would have been taken that day. No way to drive home or to search new employment. House payment would have been missed & foreclosed to put us all on the street.
I soon had much higher paying offers from clients & competition. But I was now trapped at same pay & job for years until I could attempt to break into a new field of work. Starting a entirely new career field didn't work well at all, because my passion & training was all for that job the lawyers had now sucked all profit from.