Well Fly Antonov... you are entitled to your opinion.
..and for what it's worth, I respect your contempt for certain airline practices.
However:
1 In European legislation, duty of care and minimum legal wage are two distinct (and unconnected) statutes.
2 Safety: What evidence do you have to support the suggestion that P2F crew are less safe?
3 Those who agree to bonding and/or repayment of training costs sign binding contracts. All plain and clear...with eyes wide open. There is no arm-twisting and if they don't like the terms they don't have to accept them.
4 Asking existing employees to recommend appropriate candidates for future employment is a longstanding and well-proven practice.... not just in the airline profession/industry.
Life can be harsh but these are the facts of life. Good luck all the same. bm.