There's another point to be made here. You've been talking about the airlines who are hiring new FO's on subsistence salaries, but there are still quite a few Companies out there with some sense of integrity who are prepared to pay a reasonable starting salary.
The company I work for starts FO's (Turbo-prop) on around £23000. Not a fortune, but at least you can afford some kind of a lifestyle.
There are a few who pay more.
The companies being complained about here may be taking advantage of an opportunity to make more profit on the backs of desperate people who are very anxious to justify all the money they've spent on buying a career. But ultimately these managers are immoral, callous and cynical in their attitudes, and people have long memories!
There will always be the time when these same managers will be asking staff to 'pull out the stops' to save their bacon.
Payback time?