Many reasons people don’t leave. It’s always funny though when people make up stories to justify their reasons why they haven’t left. This from a Skywest lifer thread is typical

“
I'm running into guys who left 20 year ago.

One guy, a UAL F/O wishes he'd never left.

One guy got furloughed by the same major - twice. He was literally an OO new-hire three times.

Another guy is a wide-body F/O. He could easily be a narrow-body captain but still wouldn't hold weekends off.

Everyone I know who went to SWA is happy there and making good money. I often ask them what there are doing next weekend - invariably, it's working.

Most of the guys I know that were unhappy here are unhappy elsewhere too”

Newsflash. I’ve NEVER met anyone from UA, DL, SWA or the bigger cargo carriers who think they make a mistake leaving. Crock of shjt. They guy that posted that is essentially unhirable anyway as he’s a miserable SOAB.