Not always the case, Ad-Astra. During the SARS epidemic I was working as a contract pilot in SE Asia. When the airline cancelled 100's of flights per week, the locals were still given 90 hours per week otherwise they would lose their Flight Pay. We expats were doing 2 short sectors every 8 days. If we were laid off, those in charge wouldn't get their kick-back from the contractor. We spent most days sitting in the sun drinking beer around the pool at the Omni Hotel while getting paid full salary. It was great!
But further to what others have said, 3rd world carriers don't see themselves as training organisations for Western pilots. You would only see an upgrade if there were no suitable locals and they couldn't get a contract captain from somewhere-which is pretty unlikely.