With regards to the likes of Eaglejet etc it is them whom chase airlines or whomever they can get to agree to take line training on.
They then market these schemes to the pilot community
They are without doubt the root cause of P2F
Twindiling T&C's within the industry can only really stop if we are completely United which is unlikely to happen.
However if these LT providers could somehow be eliminated from existence then it could well stop conventional P2F from continuing.