Glekichi,
IMHO there are situations where pay for ICUS may be legitimate, you have named a few; renewal training, re-currency training , contract Pilot, the private Pilot etc.
However, pay for ICUS schemes can be easily exploitated and I feel that advertising such a risky 'offer' on a Pilots union job webpage is inappropriate.
I also hope that any company offering 'pay for ICUS' is not commercially benefiting from utilising two Crew - that would be an exploitation at the highest level. I am not suggesting that this is the situation at TASAIR.