Why do you think they didn't get a penalty for race fixing, it was to try to encourage them to stay in F1 as a team.
When Mclaren where up for spying, the FIA said that the actions of one team member would result in punishment for the whole team. This cobbled together rule was soon forgotten to benefit the F1 money train and Renault.
Renault engines haven't exactly been that great this year, so I don't think the new teams will be knocking at the door waving open cheque books!
Off thread but : - Oh and where McLaren not awarded the engine management system contract for F1 in the same year thus negateing their fine. I could have got the facts wrong, just something I picked up on.