When I started in Alaska over 20 years ago, the first company I worked for plain told pilots that they didn't want you here after a year. The pay after a year went from 30 bucks a flight hour to 35 bucks a flight hour. It was more economical to them to get rid of the higher paid pilots and get newbies that do not get paid so much.
Training was minimal at the least and as long as you didn't crash during the check ride, you passed.
The second company I worked for would just fire their pilots during their 11th month of employment.
The third company I worked for fired pilots in their 6th or 7th month of employment and gave bad employment reviews.
None of these companies are still in existence.