I think everyone would agree that that sort of racket is a turd sandwich. I've said it already on this thread with reference to the Asian pay for hours then we sack you deals. No-one would argue with that. However, comparing Ryanair to these P2F scams is simply inaccurate.
Look outside your little box of Europe
From what I've heard, Canadian bush flying is a pretty closed shop, and a European abbo coming across looking for the self-improver route is unlikely to get results.
I looked at bush flying in Africa. That too is pretty saturated. MAF would have taken me but they wanted me for 4 years effectively unpaid.
I could go on but trust me, in Europe someone with an offer of a firm F/O position in Ryanair, or similar, would be mad to turn it down, even with the TR costs.