I hope you don't blame certain pilot groups for this. Can't do much when mainline owns the airplanes. I believe all 3 carriers you mentioned are ALPA. What is ALPA doing about it? I'll give you one guess...

All these years only management has taken progressive, across-the-board steps to changing the industry, and in their favor of course. Until the pilots' so-called "union" is actually unified, just expect more of the same: mainline shuffling their airplanes around to the cheapest most junior pilot group, while the senior group is forced to start over at the cheaper airlines, making less money for themselves while making more money for mainline management and flying the exact same passengers they did at their previous airline. Rinse and repeat.

We all know what is happening. The question is, what is to be done about it??