Having come across this a number of times I think any airline practising this is putting themselves in great danger. The purpose of two pilots is obvious.
Imagine the papers if a crash occured and they found out the first officer was a rookie flying for nothing. Futher more, imagine the pawyers and legal firms. They'd be out of business i no time. These desperados will get nowhere!!
Dont worry about it!!
Personally I think all the airlines are on a hiding to nothing. WHat goes around comes around!!