The fact that the media is not aware of that is not the proof that there is no risk in ptf "programs".
It is a fact that if in an airline you train pilots and then dump them and always keep low experienced pilots in the RHS, safety is reduced. You can say it is within limits, but the fact is that you are reducing safety in order to make more money, and not for operational reasons.
If an airline has a sudden expansion, the proportion of trainees will be high, and safety reduced, but this is inevitable. Pilots can't be born experienced. But after a while, those pilots become experienced ones, and then safety is again at is former level.
The safety decrease due to ptf schemes is not inevitable. Actually, it is very easy to eliminate by not doing those programs in the first place.
PTF is clearly a way of making revenue at the expense of safety. It should be illegal, for this reason among others. Well. It is illegal, only nobody has been able or willing to make judges to say so, so far.