Flying schools and TRTOs supply a service, period. They do so because the demand is there from their customers - that's YOU, not the airlines. If no-one wanted or could afford to be trained as a commercial pilot, then the 'industry' (the airline industry, not the training industry) would do something about it. As it happens, there are far more of you guys with access to these tens of thousands of pounds than the training industry knows what to do with - except that they know not to look a gift horse in the mouth, and will accept your cash with grateful, if slightly grubby, hands.
The airline industry, presented with an ever-increasing glut of newly-trained (and not yet poor) fATPLs responds as any market would: it puts up filters to control the numbers coming in. Those filters used to be based on ability: aptitude and other qualitative testing. Now the filters are financial: you pay for type ratings and, in the extreme case of Ryanair and one or two others, you effectively pay to work for your first couple of years. And still the applications flood in!
It's as well the flying public doesn't know how gullible, credulous, naive and over-burdened with money (in other words, stupid) a significant proportion of wannabes are! They'd think twice about flying with many of you...
As for expecting anyone to control this situation, dream on.
Scroggs